Update CHANGELOG and version in prep for 1.12.0 release (#721)

CHANGELOG.md

@@ -1,6 +1,15 @@
 Changelog
 =========
 
+## [1.12.0] - 2018-11-13
+### Added
+ * Add a channel, `ClosedCh`, to wait for a channel to close. (#718)
+ * Add a Code of Conduct. (#711)
+
+### Changed
+ * Tweak error message when sending a large error to  mention that we're out of space. (#716)
+ * Idle sweeper now skips connections that have pending calls. (#712)
+
 ## [1.11.0] - 2018-06-25
 ### Added
  * thrift: Support health check type in Health endpoint. (#696)
@@ -239,6 +248,7 @@ Changelog
 * Thrift support, including includes.
 
 [//]: # (Version Links)
+[1.12.0]: https://github.com/uber/tchannel-go/compare/v1.11.0...v1.12.0
 [1.11.0]: https://github.com/uber/tchannel-go/compare/v1.10.0...v1.11.0
 [1.10.0]: https://github.com/uber/tchannel-go/compare/v1.9.0...v1.10.0
 [1.9.0]: https://github.com/uber/tchannel-go/compare/v1.8.1...v1.9.0

version.go

@@ -23,4 +23,4 @@ package tchannel
 // VersionInfo identifies the version of the TChannel library.
 // Due to lack of proper package management, this version string will
 // be maintained manually.
-const VersionInfo = "1.11.0-dev"
+const VersionInfo = "1.12.0"