Better error message for sample code (#147)

tokuhirom · be-hase · commit 4216b3afcdb4 · 2019-03-28T15:45:52.000+09:00
diff --git a/README.rst b/README.rst
@@ -59,6 +59,7 @@ Usage:
         try:
             handler.handle(body, signature)
         except InvalidSignatureError:
+            print("Invalid signature. Please check your channel access token/channel secret.")
             abort(400)
 
         return 'OK'
