chore(payments): Make support for sending trial days to 0

Author: vikalpj

payments/models.py

@@ -553,7 +553,7 @@ def subscribe(self, plan, quantity=None, trial_days=None,
         cu = self.stripe_customer
 
         subscription_params = {}
-        if trial_days:
+        if trial_days is not None:
             subscription_params["trial_end"] = \
                 datetime.datetime.utcnow() + datetime.timedelta(days=trial_days)
         if token: