New release but also narrow and out of date dependencies

[timdiggins]

Just trying this out, but I'm getting the #2 which was fixed (in master) by #7

The current release is out of date -- it really needs to move from unirest to rest-client.

But also the gemspec dependencies are very tight (and old) for a gem library. This makes the wonde client incompatible with latest google-api-client for example.

Could they not be loosened by making them depend on the major and be greater than an specific version if needed?