Allow sending messages as JSON.

app.py

@@ -30,6 +30,8 @@ def send_message():
         data = request.get_data(cache=True, as_text=True)
         if "message" in request.form:
             message = request.form["message"]
+        elif request.is_json:
+            message = request.get_json()["message"]
         else:
             message = data
     else: