Allow for omniauth 2.0 series

Author: BobbyMcWho

.github/workflows/ruby.yml

@@ -1,6 +1,10 @@
 name: Ruby
 
-on: [push]
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
   test:

lib/omniauth/strategies/github.rb

@@ -75,7 +75,7 @@ def email_access_allowed?
       end
 
       def callback_url
-        full_host + script_name + callback_path
+        full_host + callback_path
       end
     end
   end

omniauth-github.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.version       = OmniAuth::GitHub::VERSION
 
-  gem.add_dependency 'omniauth', '~> 1.5'
+  gem.add_dependency 'omniauth', '>= 1.5', '< 3.0'
   gem.add_dependency 'omniauth-oauth2', '>= 1.4.0', '< 2.0'
   gem.add_development_dependency 'rspec', '~> 3.5'
   gem.add_development_dependency 'rack-test'