fix /divertmode call (#435)

* fix /divertmode call

* missing =

Author: KipK

openevsehttp/__main__.py

@@ -885,7 +885,7 @@ async def set_divert_mode(self, mode: str = "fast") -> None:
 
         # convert text to int
         new_mode = divert_mode[mode]
-        data = {"divertmode": new_mode}
+        data = "divertmode=" + str(new_mode)
         response = await self.process_request(
             url=url, method="post", data=data
         )  # noqa: E501