Fixed issue with weather test in a different timezone

[jamsi]

What does this PR do?

• I detected an issue whereby specs would fail when run in my time zone (Sydney/Australia).
• This was because pretend_now_is in the TimeWarp gem default to UTC, but the weather plugin uses Time.now.
• The solution was to modify the tests to explicitly specify the zone using Time.parse
• I also bumped the TimeWarp gem
• I also added the TravisCI build badge to the Readme

[jamsi]

Bump? Or close?

[justinweiss]

Sure :-) Is this repo still useful? It's been years since I've used HipChat, so I don't even know if they still support this API.