Fix typo in method signature of create_permission_url

Removed an unnecessary extra space in the method signature of `create_permission_url`.

Author: tylerj117

shopify/session.py

@@ -53,7 +53,7 @@ def __init__(self, shop_url, version=None, token=None, access_scopes=None):
         self.access_scopes = access_scopes
         return
 
-    def create_permission_url(self,  redirect_uri, scope=None, state=None):
+    def create_permission_url(self, redirect_uri, scope=None, state=None):
         query_params = dict(client_id=self.api_key, redirect_uri=redirect_uri)
         # `scope` should be omitted if provided by app's TOML
         if scope: query_params["scope"] = ",".join(scope)