Add rspec to devtools

Author: flash-gordon

Gemfile.devtools

@@ -8,6 +8,7 @@ group :test do
   gem "simplecov", require: false, platforms: :ruby
   gem "simplecov-cobertura", require: false, platforms: :ruby
   gem "rexml", require: false
+  gen "rspec"
 
   gem "warning"
 end