Fix typo
Fix typo

I also propose changing

> A pair of counters is cool, but what about a list of counters

to

> A pair of counters isn't cool. You know what's cool? A list of counters.
Kevin-Xi/learning_playground,Kevin-Xi/learning_playground,Kevin-Xi/learning_playground,Kevin-Xi/learning_playground,rgrempel/elm-architecture-tutorial,Kevin-Xi/learning_playground,Kevin-Xi/learning_playground