renderer is required in Django 2.1

Author: benmurden

intl_tel_input/widgets.py

@@ -48,7 +48,7 @@ def build_attrs(self, extra_attrs=None, **kwargs):
             attrs.update(extra_attrs)
         return attrs
 
-    def render(self, name, value, attrs=None):
+    def render(self, name, value, renderer=None, attrs=None):
         if value is None:
             value = ''