CHANGELOG.md in ably-rest-1.2.0

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 # Change Log
 
+## [v1.2.0](https://github.com/ably/ably-ruby/tree/v1.2.0)
+
+[Full Changelog](https://github.com/ably/ably-ruby/compare/v1.1.8...v1.2.0)
+
+This release updates ably-ruby to be compliant with the 1.2 version of the Ably client library feature specification. There are some minor breaking changes, please see [the migration guide](./UPDATING.md) for more information.
+
+**Closed issues:**
+
+- create migration guide for the upgrade to ruby 1.2  [\#347](https://github.com/ably/ably-ruby/issues/347)
+- Write spec tests for RTL17 [\#304](https://github.com/ably/ably-ruby/issues/304)
+- Write spec tests for RTL16, RTL16a [\#303](https://github.com/ably/ably-ruby/issues/303)
+- Write spec tests for RTL4m [\#302](https://github.com/ably/ably-ruby/issues/302)
+- Write spec tests for RTL4l [\#301](https://github.com/ably/ably-ruby/issues/301)
+- Write spec tests for RTL4k, RTL4k1 [\#300](https://github.com/ably/ably-ruby/issues/300)
+- Write spec tests for RTL4j, RTL4j1, RTL4j2 [\#299](https://github.com/ably/ably-ruby/issues/299)
+- Write spec tests for RTS3c, RTS3c1 [\#298](https://github.com/ably/ably-ruby/issues/298)
+- Write spec tests for RTS3a [\#297](https://github.com/ably/ably-ruby/issues/297)
+- Add support for RTL21 [\#296](https://github.com/ably/ably-ruby/issues/296)
+- Add support for RTL17 [\#292](https://github.com/ably/ably-ruby/issues/292)
+- Add support for RTL16, RTL16a [\#291](https://github.com/ably/ably-ruby/issues/291)
+- Add support for RTL4m [\#290](https://github.com/ably/ably-ruby/issues/290)
+- Add support for RTL4l [\#289](https://github.com/ably/ably-ruby/issues/289)
+- Add support for RTL4k, RTL4k1 [\#288](https://github.com/ably/ably-ruby/issues/288)
+- Add support for RTL4j, RTL4j1, RTL4j2 [\#287](https://github.com/ably/ably-ruby/issues/287)
+- Add support for RTS3c, RTS3c1 [\#286](https://github.com/ably/ably-ruby/issues/286)
+- Add support for RTS3a [\#285](https://github.com/ably/ably-ruby/issues/285)
+- Write spec tests for RSL1a, b, h, k1, k2, l, l1 \(Channels\) [\#283](https://github.com/ably/ably-ruby/issues/283)
+- Write spec tests for RSN3a, c \(Channels\) [\#282](https://github.com/ably/ably-ruby/issues/282)
+- Write spec tests for RSA4b, b1, c, RSA16 \(Authentication\) [\#281](https://github.com/ably/ably-ruby/issues/281)
+- Add support for RSN3a, c \(Channels\) [\#269](https://github.com/ably/ably-ruby/issues/269)
+- Add support for RSA4b, b1, c, RSA16 \(Authentication\) [\#268](https://github.com/ably/ably-ruby/issues/268)
+- Add support for RSC7a, RSC7c \(RestClient\)
+ [\#266](https://github.com/ably/ably-ruby/issues/266)
+- Add support for Test Guidance G4 [\#265](https://github.com/ably/ably-ruby/issues/265)
+- Add support for TO3o, TO3p [\#264](https://github.com/ably/ably-ruby/issues/264)
+
+**Merged pull requests:**
+
+- Add migration guide from 1.1.8 to 1.2.0 [\#348](https://github.com/ably/ably-ruby/pull/348) ([TheSmartnik](https://github.com/TheSmartnik))
+- RTL21 [\#345](https://github.com/ably/ably-ruby/pull/345) ([lukaszsliwa](https://github.com/lukaszsliwa))
+- RTL4j [\#341](https://github.com/ably/ably-ruby/pull/341) ([TheSmartnik](https://github.com/TheSmartnik))
+- RSL1a, RSL1b [\#340](https://github.com/ably/ably-ruby/pull/340) ([lukaszsliwa](https://github.com/lukaszsliwa))
+- Add support for RSA4b, b1, c, RSA16 \(Authentication\) [\#338](https://github.com/ably/ably-ruby/pull/338) ([lukaszsliwa](https://github.com/lukaszsliwa))
+- ChannelOptions related tasks [\#336](https://github.com/ably/ably-ruby/pull/336) ([TheSmartnik](https://github.com/TheSmartnik))
+- Update RSC7 [\#334](https://github.com/ably/ably-ruby/pull/334) ([TheSmartnik](https://github.com/TheSmartnik))
+
 ## [v1.1.8](https://github.com/ably/ably-ruby/tree/v1.1.8)
 
 [Full Changelog](https://github.com/ably/ably-ruby/compare/v1.1.7...v1.1.8)
 
 **Fixed bugs:**