README.md in drive_env-0.1.0 vs README.md in drive_env-0.2.pre1

@@ -21,19 +21,19 @@
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'drive_env'
+gem 'drive_env', '~> 0.2.pre1'
 ```
 
 And then execute:
 
     $ bundle
 
 Or install it yourself as:
 
-    $ gem install drive_env
+    $ gem install drive_env --pre
 
 ## Usage
 
 First, you need to login Google Cloud Platform and enable APIs.