Update README.md

Author: odinserj

README.md

@@ -11,7 +11,7 @@ Installing Sphinx
 [Official installation guide](http://sphinx-doc.org/latest/install.html) describes all steps 
 required to run Sphinx on Windows / Linux / Mac OS X.
 
-*You are not required* to install Sphinx – documentation is being automatically deployed to the site after each commit. For small changes just propose a pull request. Thanks to [Read the Docs](https://readthedocs.org) service for help!
+**You are not required** to install Sphinx – documentation is being automatically deployed to the site after each commit. For small changes just propose a pull request. Thanks to [Read the Docs](https://readthedocs.org) service for help!
 
 Building
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