Update setup.py version for release (#85)

Author: ajrice6713

setup.py

@@ -15,7 +15,7 @@
 
 setup(
     name='bandwidth-sdk',
-    version='13.3.0',
+    version='13.4.0',
     description='Bandwidth\'s set of APIs',
     long_description=long_description,
     long_description_content_type="text/markdown",