Refactor SoupPage's post method to return JSON response if content ty…

…pe is application/json

sdk/harambe/contrib/soup/impl.py

@@ -123,7 +123,7 @@ async def post(
         self._url = res.url
         content_type = res.headers.get("Content-Type", "")
         if "application/json" in content_type:
-            return SoupResponseWithStatus(res.status_code, res.text)
+            return SoupResponseWithStatus(res.status_code, res.json())
 
         self._soup = BeautifulSoup(res.text, "html.parser")