Fix dependency issue with superagent-retry

superagent-retry version was bumped to 0.2.0 since creation of hub.
Commit locks version to 0.1.1.

"\*" causes the following npm error:
**npm ERR! peerinvalid The package superagent does not satisfy its siblings' peerDependencies requirements!**

**npm ERR! peerinvalid Peer superagent-retry@0.2.0 wants superagent@~0.16.0**