Release 1.3.2 with colab improvements.

PiperOrigin-RevId: 177762544

Author: Lukasz Kaiser

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name='tensor2tensor',
-    version='1.3.1',
+    version='1.3.2',
     description='Tensor2Tensor',
     author='Google Inc.',
     author_email='no-reply@google.com',