chore(release): Version 1.3.1.

Author: vogoltsov

setup.py

@@ -13,7 +13,7 @@
 
 setup(
     name='robotframework-docker',
-    version='1.3.1.dev1',
+    version='1.3.1',
     description='A Robot Framework Docker Library',
     long_description=long_description,
     url='https://github.com/vogoltsov/robotframework-docker',