API: minor fix

README.md

@@ -1,3 +1,8 @@
 # mpwo
 
+[![Python Version](https://img.shields.io/badge/python-3.6-brightgreen.svg)](https://python.org)
+[![Flask Version](https://img.shields.io/badge/flask-0.12-brightgreen.svg)](http://flask.pocoo.org/) 
+[![React Version](https://img.shields.io/badge/react-16.2-brightgreen.svg)](https://reactjs.org/)  
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/45d64b31e37e4890a239b8298e66a011)](https://www.codacy.com/app/SamR1/mpwo?utm_source=github.com&utm_medium=referral&utm_content=SamR1/mpwo&utm_campaign=badger)  
+
 Self hosted workout/activity tracker written in Python.  

mpwo_api/mpwo_api/users/models.py

@@ -28,7 +28,8 @@ class User(db.Model):
         ).decode()
         self.created_at = created_at
 
-    def encode_auth_token(self, user_id):
+    @staticmethod
+    def encode_auth_token(user_id):
         """Generates the auth token"""
         try:
             payload = {