Prepare 1.1.2 release. (#89)

CHANGELOG.md

@@ -4,7 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+<!-- ## [Unreleased] -->
+
+## [1.1.2] - 2018-02-07
 - Elements that are constructable (usually a call to the Polymer function whose result is assigned to some variable) can now have behaviors.
 - The `--deleteExisting` command line flag will no longer delete `.d.ts` files that are referenced as values in the `addReferences` config option, since such files are typically hand-written.