README.md in wordle-0.6.0 vs README.md in wordle-0.7.0

@@ -18,9 +18,10 @@
 
 ```
 Usage: wordle [options]
     -i, --identifier=IDENTIFIER      Pass word identifer to target a specific word that someone else has played. Identifier gets printed at the end of the game to share with a friend.
     -d, --difficult                  Hard mode. Any revealed hints must be used in subsequent guesses.
+    -c, --contrast                   High contrast mode. Matched letters will be orange. Included letters will be blue.
 ```
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.