! Fix grammar error in readme text

README.md

@@ -65,7 +65,7 @@ scripts that relay on your current database data so you should fix them.
 
 Issue Tracker
 -------------
-We don't use github issue tracker only for contributions management. If you want to post an issue please use our [Issue Tracker](http://project.ecomdev.org/projects/mage-unit)
+We use github issue tracker only for contributions management. If you want to post an issue please use our [Issue Tracker](http://project.ecomdev.org/projects/mage-unit)
 
 Contributions
 -------------
@@ -77,4 +77,4 @@ If you want to take a part in improving our extension please create branches bas
         $ git checkout -b [your-name]/[feature] dev
 
 
-Then submit them for pull request. 
\ No newline at end of file
+Then submit them for pull request.