README.md in goatmail-1.1.1 vs README.md in goatmail-1.2.0

@@ -37,10 +37,12 @@
     mount Goatmail::App, at: "/inbox"
   end
 end
 ```
 
+If you use the Rails 5, Please use a combination with the Sinatra 2.0 later version.
+
 ## Padrino Setup
 
 Then set the delivery method and mount app in `config/apps.rb`
 
 ```ruby
@@ -56,10 +58,23 @@
   Padrino.mount('Goatmail::App').to('/inbox')
 end
 Padrino.mount('SampleProject::App', :app_file => Padrino.root('app/app.rb')).to('/')
 ```
 
+If an exception occurs that "Gem Load Error is: undefined method 'version' for Padrino:Module", please try this:
+
+```ruby
+# Gemfile
+gem 'goatmail', :group => :development, :require => false
+
+# config/boot.rb
+Padrino.before_load do
+  require 'goatmail'
+end
+```
+
+
 ## Sinatra Sample
 
 ```ruby
 # app.rb
 module Sample
@@ -81,11 +96,13 @@
 # config.ru
 map '/' do
   run Sample::App.new
 end
 
-map '/inbox' do
-  run Goatmail::App.new
+if ENV['RACK_ENV'] == 'development'
+  map '/inbox' do
+    run Goatmail::App.new
+  end
 end
 ```
 
 See: [Sample Applications](https://github.com/tyabe/goatmail_sample)