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docs/releases/2.2.0.md

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+## Peatio 2.2.0 (June 3, 2019) ##
+
+### Overview ###
+
+We are pleased to present Peatio Open Source 2.2.0.
+
+This release concentrated on Plugable Coins API development new features and enhancements:
+
+    1. New admin roles integration.
+    2. Admin panel RBAC.
+    3. Daemons stability and performance improvements.
+    3. Foundation for third party trading engine integration.
+
+This release notes is must-read for migrating from older versions.
+
+### Breaking changes ###
+
+- [#2168](https://github.com/rubykube/peatio/pull/2168): Plugable Coins API
+
+  This PR is gives ability gives ability to extend Peatio with new coins implementation.
+
+  Such a big architecture improvements usually brings breaking changes.
+
+  Core Peatio supports Ethereum, Bitcoin and Litecoin(as a plugin) blockchains.
+  It means that you need to build custom image if you want to integrate other coins.
+  For guide of how to build custom docker image check [documentation](../plugins.md).
+  For coin integration guide check **doc/integration.md** of appropriate coin e.g([litecoin](https://github.com/rubykube/peatio-litecoin/blob/master/docs/integration.md)).
+  You will find the list of approved coin plugins [here](../coins/plugins.md).
+
+- [#2242](https://github.com/rubykube/peatio/pull/2242): Reorganization ruby and amqp workers.
+
+  Raw ruby daemons starting script was unified in the same way as we do for AMQP daemons.
+
+  So now to start ruby daemon you need to run the next command:
+  ```bash
+  bundle exec ruby lib/daemons/daemons.rb daemon_name
+  ```
+
+- [#2241](https://github.com/rubykube/peatio/pull/2241): Major Market model rework.
+
+  This patch makes bunch of changes in Market model and related APIs, controllers and configuration.
+
+  Here is the full list of braking changes for more info check [PR](https://github.com/rubykube/peatio/pull/2241):
+
+  * Replace Market `enabled` with `state` and list new states (without
+  logic implementation)
+  * Rework public/market API response structure
+  * Rename Market API error name `market.market.doesnt_exist` -> `market.market.doesnt_exist_or_not_enabled`
+  * Add ability to disable all markets
+  * Remove precision equivalence validation (now amount and price precision could be different)
+  * Add precisions sum validation (amount + price precision < 12)
+  * Merge min_bid_amount & min_ask_amount to min_amount
+  * Update Market seeds
+  * Rename ask_precision -> amount_precision, bid_precision -> price_precision
+  * Rename min_ask_price -> min_price, max_bid_price -> max_price
+  * Rename ask_unit -> base_unit, bid_unit -> quote_unit
+
+- [#2267](https://github.com/rubykube/peatio/pull/2267): Move slave book from amqp to ruby daemons.
+
+  This PR changes slave book daemon type from AMQP daemon to raw ruby one.
+
+  Now to start slave book you need to run `bundle exec ruby lib/daemons/daemons.rb slave_book`.
+
+- [#2257](https://github.com/rubykube/peatio/pull/2257): Refactor blockchain daemon.
+
+  Now Blockchain daemon doesn't scaling and BLOCKCHAINS env variable.
+
+  Current version of Blockchain daemon starts separate thread per blockchain which works simultaneously and doesn't depend on each other.
+  So it doesn't need scaling to multiple process and BLOCKCHAINS env variable.
+
+- [#2258](https://github.com/rubykube/peatio/pull/2258): Major trading engine and logic rework with precision, rounding and matching flow improvements.
+
+  Trading engine rework includes bunch of flow enhancements:
+  * Remove rounding on order creation
+  * Validate volume and price precision on order creation
+  * Return invalid_price_or_volume error in case of fractional part overflow
+  * Validate Market min_price, max_price and min_amount depending on amount and price precision
+  * Market amount_precision + price_precision < FUNDS_PRECISION = 12
+  * Set Market FEE_PRECISION to 4
+  * Round estimated funds on market order creation
+  * Rewrite Matching::Engine from scratch without recursion
+  * Update markets.yml.erb with new min_price, min_amount
+    
+### New Features ###
+
+- Admin panel RBAC. New admin roles support [#2217](https://github.com/rubykube/peatio/pull/2217) ([chumaknadya](https://github.com/chumaknadya))
+
+  Now we support the next list of admin privileged roles:
+  * Super admin
+  * Admin
+  * Accountant
+  * Compliance
+  * Technical
+  * Support
+
+  For the list of permissions for each role check [PR](https://github.com/rubykube/peatio/pull/2217)
+
+- AMQP messages for third party trading engine integration [\#2215](https://github.com/rubykube/peatio/pull/2215) ([ysv](https://github.com/ysv))
+
+  Our plan is to support third party trading engine, so we can replace all peatio trading daemons without breaking compatibility.
+  This PR adds functionality of publishing Order submit and cancel, Liability create events to RMQ.
+
+- Add management API endpoint for listing trades [\#2182](https://github.com/rubykube/peatio/pull/2182) ([ymasiuk](https://github.com/ymasiuk))
+- Change order 'state' to int for order\_processor [\#2205](https://github.com/rubykube/peatio/pull/2205) ([mnaichuk](https://github.com/mnaichuk))
+- AMQP messages for third party trading engine integration [\#2215](https://github.com/rubykube/peatio/pull/2215) ([ysv](https://github.com/ysv))
+- Use json format for logs [\#2232](https://github.com/rubykube/peatio/pull/2232) ([denisfd](https://github.com/denisfd))
+- Retry withdraw on failure [\#2233](https://github.com/rubykube/peatio/pull/2233) ([shal](https://github.com/shal))
+- Change: config/database.yml – use port value from ENV [\#2254](https://github.com/rubykube/peatio/pull/2254) ([matass](https://github.com/matass))
+- Add min\_confirmations field to Currency model entity [\#2276](https://github.com/rubykube/peatio/pull/2276) ([mnaichuk](https://github.com/mnaichuk))
+- Add bitcoincash and ripple [\#2284](https://github.com/rubykube/peatio/pull/2286)([ymasiuk](https://github.com/ymasiuk))
+
+### Enhancements ###
+
+- Skip withdrawal in case of insufficient balance on hot wallet [\#2179](https://github.com/rubykube/peatio/pull/2179) ([mnaichuk](https://github.com/mnaichuk))
+- Update RBAC roles [\#2237](https://github.com/rubykube/peatio/pull/2237) ([mnaichuk](https://github.com/mnaichuk))
+- Add WS message for market order executed event [\#2208](https://github.com/rubykube/peatio/pull/2208) ([mnaichuk](https://github.com/mnaichuk))
+- Replace Passgen gem with new password generator [\#2245](https://github.com/rubykube/peatio/pull/2245) ([mnaichuk](https://github.com/mnaichuk))
+- Update Readme [\#2250](https://github.com/rubykube/peatio/pull/2250) ([liutenko](https://github.com/liutenko))
+- Improve sentry-raven error reporting [\#2236](https://github.com/rubykube/peatio/pull/2236) ([mnaichuk](https://github.com/mnaichuk))
+- Update logs in withdraw\_coin worker [\#2234](https://github.com/rubykube/peatio/pull/2234) ([denisfd](https://github.com/denisfd))
+- Update ruby version and gems [\#2263](https://github.com/rubykube/peatio/pull/2263) ([mod](https://github.com/mod))
+- Multi coin support for altcoins [\#2243](https://github.com/rubykube/peatio/pull/2243) ([Xicy](https://github.com/Xicy))
+
+### Bug Fixes ###
+
+- Remove JWT token from response payload [\#2265](https://github.com/rubykube/peatio/pull/2265) ([shal](https://github.com/shal))
+- Remove http request for confirmations method [\#2262](https://github.com/rubykube/peatio/pull/2262) ([mnaichuk](https://github.com/mnaichuk))
+- Reload blockchain from DB before sync [\#2269](https://github.com/rubykube/peatio/pull/2269) ([mnaichuk](https://github.com/mnaichuk))
+- Fix bin/gendocs [\#2272](https://github.com/rubykube/peatio/pull/2272) ([mnaichuk](https://github.com/mnaichuk))
+- Fix issue with rake task release.rake in travis [\#2275](https://github.com/rubykube/peatio/pull/2275) ([mnaichuk](https://github.com/mnaichuk))
+- Fix GET /withdraws to include both fiat and crypto  [\#2222](https://github.com/rubykube/peatio/pull/2222) ([msembinelli](https://github.com/msembinelli))
+- Remove withdrawal attempts [\#2280](https://github.com/rubykube/peatio/pull/2280) ([mnaichuk](https://github.com/mnaichuk))
+- Fix double spending issue on withdraw [\#2280](https://github.com/rubykube/peatio/pull/2280) ([mnaichuk](https://github.com/mnaichuk))