Fixed typo.

Author: cmfcmf

README.md

@@ -1,6 +1,6 @@
 OpenWeatherMap-PHP-Api
 ======================
-An php api to parse weather data from [OpenWeatherMap.org](http://www.OpenWeatherMap.org). This api tries to normalise and abstract the data and remove inconsistencies.
+A php api to parse weather data from [OpenWeatherMap.org](http://www.OpenWeatherMap.org). This api tries to normalise and abstract the data and remove inconsistencies.
 
 If you are looking for an implementation for the [CMS Zikula](http://www.zikula.org), you may want to take a look at [cmfcmf/Weather](https://github.com/cmfcmf/Weather).