Removing unnecessary line and switching to tilde operator

The `guzzlehttp/guzzle' package will automatically pull in the streams
dependency by itself, so we do not need to list it as an additional
dependency. Also switching to tilde operators since it makes it clear that we're
following semantic versioning.

Change-Id: I8b45184242fc538ea2d92275d9e0e4137e744f70
Merge "Removing unnecessary line and switching to tilde operator"