Update README.md

Author: Andrei Scheinkman

most-common-name/README.md

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 ### Most Common Name
 
-This repo contains the code and data behind the story:
+This directory contains the code and data behind the story:
 
 [Dear Mona, What’s The Most Common Name In America?](http://fivethirtyeight.com/features/whats-the-most-common-name-in-america/)