ah, why requireing v2.0.2 of omniauth gem? it should be oauth2 gem

Author: nov

omniauth-oauth2.gemspec

@@ -3,8 +3,8 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "omniauth-oauth2/version"
 
 Gem::Specification.new do |gem|
-  gem.add_dependency "oauth2",     [">= 1.4", "< 3"]
-  gem.add_dependency "omniauth",   [">= 2.0.2", "< 3"]
+  gem.add_dependency "oauth2",  [">= 2.0.2", "< 3"]
+  gem.add_dependency "omniauth", "~> 2.0"
 
   gem.add_development_dependency "bundler", "~> 2.0"