Bump omniauth-oauth2 to 1.4

Author: zquestz

omniauth-google-oauth2.gemspec

@@ -15,7 +15,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
 
   gem.add_runtime_dependency 'omniauth', '>= 1.1.1'
-  gem.add_runtime_dependency 'omniauth-oauth2', '~> 1.3.1'
+  gem.add_runtime_dependency 'omniauth-oauth2', '~> 1.4'
   gem.add_runtime_dependency 'jwt', '~> 1.0'
   gem.add_runtime_dependency 'multi_json', '~> 1.3'
   gem.add_runtime_dependency 'addressable', '~> 2.3'