fix typo

README.md

@@ -92,7 +92,7 @@ Some people may receive this error when trying to run the `sass --watch` command
   Use --trace for backtrace.
 ```
 
-This is a known issue with the [Sass on MaxOS Maverick](http://stackoverflow.com/questions/22413834/getting-error-when-using-command-line-for-sass-to-watch-files) as indicated install the `rb-fsevent` gem
+This is a known issue with the [Sass on MacOS Maverick](http://stackoverflow.com/questions/22413834/getting-error-when-using-command-line-for-sass-to-watch-files) as indicated install the `rb-fsevent` gem
 
 ```bash
 gem install rb-fsevent