Bump Python driver to 1.15.0-2

Author: Etienne Laurin

drivers/python/setup.py

@@ -5,7 +5,7 @@
 setup(
     name="rethinkdb",
     zip_safe=True,
-    version="1.15.0-1",
+    version="1.15.0-2",
     description="This package provides the Python driver library for the RethinkDB database server.",
     url="http://rethinkdb.com",
     maintainer="RethinkDB Inc.",