typo fix #2

Author: filisko

README.md

@@ -75,7 +75,7 @@ $articleQuery = $orm->query('article');
 ### Configuration
 
 By default ORM assumes that the table name is the plural of the name of the model, and that the name of the primary key is 'id'.
-For MongoDB database the default id field '_id' is assumed. You can ovveride these settings for a particular model in your
+For MongoDB database the default id field '_id' is assumed. You can override these settings for a particular model in your
 configuration file:
 
 ```php