Added Flask-RESTful to the requirements

requirements.txt

@@ -11,6 +11,7 @@ Flask-Mail==0.9.1
 Flask-Migrate==1.3.0
 Flask-Plugins==1.5
 Flask-Redis==0.0.6
+Flask-RESTful==0.3.1
 Flask-Script==2.0.5
 Flask-SQLAlchemy==2.0
 Flask-Themes2==0.1.3