Update README.md (#429)

Readjusted fonts.  Not quite sure how I keep screwing it up.

README.md

 # Steemit.com
-Steemit.com is the react.js web interface to the world's first and best blockchain-based social media platform.  It uses [STEEM](https://github.com/steemit/steem), a blockchain powered by Graphene 2.0 technology to store JSON-based content for a plethora of web applications.   
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+Steemit.com is the react.js web interface to the world's first and best blockchain-based social media platform.  It uses [STEEM](https://github.com/steemit/steem), a blockchain powered by Graphene 2.0 technology to store JSON-based content for a plethora of web applications.   
 
 ## Why would I want to use Steemit.com?
 * Learning how to build blockchain-based web applications using STEEM as a content storage mechanism in react.js