stdin2discord: get webhook url from env var

stdin2discord.py

@@ -1,12 +1,13 @@
 import sys
 import requests
+import os
 
 def send(_msg: str):
     if len(_msg) == 0:
         return
 
     r = requests.post(
-                      url='https://discord.com/api/webhooks/936927833572380692/QrqoK8aVCOkGFh1L0HaHPd_Z-Usj-ubhXYvHadZyCA1Y5GOB7-0xWmuyKI9l4byvKjQ1',
+                      url=os.environ['DISCORD_WEBHOOK'],
                       data=f'content=```diff\n{requests.utils.quote(_msg)}```'.encode('utf-8'),
                       headers = {'Content-Type': 'application/x-www-form-urlencoded'}
                      )