hooray rails5, update dependencies

[jerrygreen]

I'm still using this lib D:
I have just updated dependencies
It should work just fine

Unfortunately, rails5 requires ruby 2.2.2+ so travis will fail on ruby 1.9.3

[bithavoc]

@jerrygreen would you like to be a maintainer of this gem?

[jerrygreen]

@bithavoc I think more yes than no. But I'm not sure about my responsibilities though 😄

[bithavoc]

@jerrygreen you will be given collaborator status, can merge stuff and let me know when you need a new release of the gem.

[bithavoc]

@jerrygreen for starters, make sure tests are passing :)

[jerrygreen]

@bithavoc I think we need to get rid of ruby 1.9.3 from ci for master branch

[bithavoc]

@jerrygreen let's do a major version bump then, we follow semver.