Using concurrent.futures to format multiple files at the same time
diff --git a/CHANGELOG b/CHANGELOG
index 222e2d5..1a9b7b3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,7 +2,9 @@
# All notable changes to this project will be documented in this file.
# This project adheres to [Semantic Versioning](http://semver.org/).
-## [0.13.3] UNRELEASED
+## [0.14.0] UNRELEASED
+#### Added
+- formatting can be run in parallel using the "-p" / "--parallel" flags.
### Fixed
- "not in" and "is not" should be subtyped as binary operators.
- A non-Node dictionary value may have a comment before it. In those cases, we