add new regenerate_rates method corresponding to the new rerate api

Author: Roguelazer

easypost/__init__.py

@@ -721,6 +721,13 @@ def track_with_code(cls, api_key=None, **params):
         response, api_key = requestor.request('get', url, params)
         return response
 
+    def regenerate_rates(self):
+        requestor = Requestor(self._api_key)
+        url = "%s/%s" % (self.instance_url(), "rerate")
+        response, api_key = requestor.request('post', url)
+        self.refresh_from(response, api_key)
+        return self
+
     def get_rates(self):
         requestor = Requestor(self._api_key)
         url = "%s/%s" % (self.instance_url(), "rates")