added debugger to Gemfile

Gemfile

@@ -11,6 +11,13 @@ group :test do
   gem 'coveralls', require: false
 end
 
+group :development do
+  # For debugger
+  gem "pry-rails", "~> 0.3.2"
+
+  gem "pry-debugger", "~> 0.2.2"
+end
+
 # Specify your gem's dependencies in weixin_authorize.gemspec
 gemspec