Check with defined? to automatically load extensions

README.md

@@ -11,18 +11,6 @@ Installation
 
 `gem install voight_kampff`
 
-If you're using Rails and want to add `ActionDispatch::Request#bot?` and `ActionDispatch::Request#human?` methods, require `voight_kampff/rails`:
-
-```Gemfile
-gem 'voight_kampff', require: 'voight_kampff/rails'
-```
-
-if you're using pure Rack, require it the following way:
-
-```Gemfile
-gem 'voight_kampff', require: 'voight_kampff/rack'
-```
-
 Configuration
 -------------
 
@@ -62,23 +50,6 @@ In general the `#bot?` command tends to include all of these and I'm sure it's u
 
 Also, the gem no longer extends `ActionDispatch::Request` instead it extends `Rack::Request` which `ActionDispatch::Request` inherits from. This allows the same functionality for Rails while opening the gem up to other rack-based projects.
 
-Upgrading to version 2.0
-------------------------
-
-If you use Rails and `ActionDispatch::Request#bot?` and `ActionDispatch::Request#human?` methods, change your gemfile:
-
-```diff
--gem 'voight_kampff'
-+gem 'voight_kampff', require: 'voight_kampff/rails'
-```
-
-If you use Rack, change your gemfile:
-
-```diff
--gem 'voight_kampff'
-+gem 'voight_kampff', require: 'voight_kampff/rack'
-```
-
 FAQ
 ---
 __Q:__ __What's with the name?__  

lib/voight_kampff.rb

@@ -26,3 +26,6 @@ def test(user_agent_string)
     end
   end
 end
+
+require 'voight_kampff/rack' if defined?(Rack)
+require 'voight_kampff/rails' if defined?(Rails::Railtie)