bump version to 1.13.2

Author: Marc-André Rivet

CHANGELOG.md

@@ -2,7 +2,7 @@
 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Unreleased] - 2020-06-18
+## [1.13.2] - 2020-06-18
 ### Fixed
 - [#1305](https://github.com/plotly/dash/issues/1305)
     - Fix regression that causes crash when `FLASK_ENV` is modified during app execution

dash/version.py

@@ -1 +1 @@
-__version__ = "1.13.1"
+__version__ = "1.13.2"