Release 0.1.1 - add dependency constraint for omniauth 1.x

[koshilife]

Hi, @kazasiki

Could you review this PR about #32 issue?

I tested manually in remote server with https communication environment, and confirmed following.

• should use omniauth 1.x series.
• should return credentials in auth hash. (regression scenarios)

If you want to try my branch, you can use like following in your Gemfile.

gem 'omniauth-line', github: 'koshilife/omniauth-line', branch: '#32_add_dependency_constraint_for_omniauth_1.x'