README.md in lifegame-0.1.1 vs README.md in lifegame-0.2.0

@@ -27,11 +27,11 @@
 
 ## Usage
 
 ```ruby
 # 20 x 50
-game = Lifegame::Lifegame.new(20, 50)
+game = Lifegame::Game.new(20, 50)
 
 # eg: grader
 game[2,7].be!; game[2,8].be!; game[2,9].be!; game[1,7].be!; game[0,8].be!
 
 # print
@@ -45,9 +45,15 @@
 game.start
 
 # random with alive frequency
 game.sow!(0.2)
 game.start
+```
+
+or on your shell
+
+```sh
+$ lifegame
 ```
 
 ## License
 
 The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).