Change dependency URL for Snappy
Change dependency URL for Snappy

[Snappy has been migrated from Google Code to GitHub](https://github.com/golang/snappy/commit/eaa750b9bf4dcb7cb20454be850613b66cda3273). If you try to `go get` with the code.google.com URL in place, `go get` chokes because of the 302 redirect.

Upstream, Shopify did the same thing [here](https://github.com/Shopify/sarama/commit/6d47b6cfdee82ba22aee428ea46d9934c097f49b)
gyroscope-innovations/legacy_sarama,gyroscope-innovations/legacy_sarama