fix multiline string

transporte/models.py

@@ -34,9 +34,9 @@ class User(UserMixin, db.Model):
 
         # send login email
         msg = Message('Your LOC transport tool credentials!', recipients=[self.login])
-        msg.body = 'Hi, na! \n\n' +
-                   'Thank you for helping us keeping an overview of your transports :) \n' +
-                   'Here is your login link: {}'.format(url_for('login_with_token', token=token, _external=True))
+        msg.body = ('Hi, na! \n\n'
+                    'Thank you for helping us keeping an overview of your transports :) \n'
+                    'Here is your login link: {}'.format(url_for('login_with_token', token=token, _external=True)))
 
         mail.send(msg)