Bump setup.py to 1.13.2 -- Travis is green.

PiperOrigin-RevId: 242497797

Author: afrozenator

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name='tensor2tensor',
-    version='1.13.1',
+    version='1.13.2',
     description='Tensor2Tensor',
     author='Google Inc.',
     author_email='no-reply@google.com',