Bump version to v0.20.0
diff --git a/CHANGELOG b/CHANGELOG
index fa127c8..be1ffb1 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,7 +2,7 @@
 # All notable changes to this project will be documented in this file.
 # This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [0.19.1] UNRELEASED
+## [0.20.0] 2017-11-14
 ### Added
 - Improve splitting of comprehensions and generators. Add
   `SPLIT_PENALTY_COMPREHENSION` knob to control preference for keeping