Change dependency order for rubocop

Author: StefSchenkelaars

rspec-github.gemspec

@@ -22,6 +22,6 @@ Gem::Specification.new do |spec|
   spec.files = Dir['{lib}/**/*']
 
   spec.add_runtime_dependency 'rspec-core', '~> 3.0'
-  spec.add_development_dependency 'rubocop', '~> 0.81.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
+  spec.add_development_dependency 'rubocop', '~> 0.81.0'
 end