Update CHANGELOG.md for 1.0.0

Author: kevinoid

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Change Log
 
+## [1.0.0](https://github.com/kevinoid/git-branch-is/tree/1.0.0) (2018-06-01)
+[Full Changelog](https://github.com/kevinoid/git-branch-is/compare/v0.1.0...1.0.0)
+
+- Branch name regex support [\#22](https://github.com/kevinoid/git-branch-is/issues/22)
+  (and [\#23](https://github.com/kevinoid/git-branch-is/pull/23), partially)
+- Support for case-insensitive comparison and matching.
+- Support for passing a test function to `gitBranchIs`.
+- Drop support for Node 0.10 and 0.12.
+- Bump to 1.0.0 to declare API as stable.
+
 ## [0.1.0](https://github.com/kevinoid/git-branch-is/tree/0.1.0) (2016-04-01)