Update subgen.py

Added some warning messages if you try to access webhooks via GET (Browsers or wget for example) instead of how you're supposed to.  Can also be used to troubleshoot network stuff a bit.

subgen/subgen.py

@@ -88,6 +88,15 @@ if debug:
 else:
     logging.basicConfig(stream=sys.stderr, level=logging.INFO)
 
+@app.get("/plex")
+@app.get("/webhook")
+@app.get("/jellyfin")
+@app.get("/asr")
+@app.get("/emby")
+@app.get("/detect-language")
+def handle_get_request(request: Request):
+    return "You accessed this request incorrectly via a GET request.  See https://github.com/McCloudS/subgen for proper configuration"
+
 @app.post("/webhook")
 async def print_warning():
     print("*** This is the legacy webhook.  You need to update to webhook urls to end in plex, tautulli, or jellyfin instead of webhook. ***")