CHANGELOG.md in ably-rest-1.2.6

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 # Change Log
 
+## [v1.2.6](https://github.com/ably/ably-ruby/tree/v1.2.6)
+
+[Full Changelog](https://github.com/ably/ably-ruby/compare/v1.2.5...v1.2.6)
+
+**Implemented enhancements:**
+
+- [ably-ruby][no-connection-serial] Implement connection resume/recover [\#393](https://github.com/ably/ably-ruby/issues/393)
+- [ably-ruby][no-connection-serial] Implement missing internal presence [\#392](https://github.com/ably/ably-ruby/issues/392)
+- [ably-ruby][no-connection-serial] Implement code + tests for no-connection-serial [\#378](https://github.com/ably/ably-ruby/issues/378)
+
+**Closed issues:**
+
+- Remove unimplemented push activation methods [\#417](https://github.com/ably/ably-ruby/issues/417)
+- Failing Test - updates attach\_serial [\#415](https://github.com/ably/ably-ruby/issues/415)
+- Failing Test - retrieves two pages of messages before channel was attached [\#414](https://github.com/ably/ably-ruby/issues/414)
+- [ably-ruby] Fix failing tests [\#394](https://github.com/ably/ably-ruby/issues/394)
+
+## [v1.2.5](https://github.com/ably/ably-ruby/tree/v1.2.5)
+
+This contains an important fix for a TLS certificate validation bug which prevented the library from being able to use Realtime fallback hosts.
+
+[Full changelog](https://github.com/ably/ably-ruby/compare/v1.2.4...v1.2.5)
+
+**Fixed bugs:**
+
+- Fix server certificate validation for HTTP in Realtime [\#397](https://github.com/ably/ably-ruby/pull/397)
+
 ## [v1.2.4](https://github.com/ably/ably-ruby/tree/v1.2.4)
 
 [Full Changelog](https://github.com/ably/ably-ruby/compare/v1.2.3...v1.2.4)
 
 **Merged pull requests:**