Update link to snappy home page in setup.py

Part of the effort at
https://groups.google.com/d/msg/snappy-compression/iKpuTpTcjOI/-1ryGHegBgAJ

Author: slel

setup.py

@@ -33,7 +33,7 @@
 long_description = """
 Python bindings for the snappy compression library from Google.
 
-More details about Snappy library: http://code.google.com/p/snappy
+More details about Snappy library: http://google.github.io/snappy
 """