chat api var added

Author: sourovamin

config.py

@@ -53,6 +53,7 @@ class Config(object):
     PREAUTH = os.environ.get('PREAUTH') or False
     WHITELISTED_IPS = os.environ.get('WHITELISTED_IPS') or ""
     SLACK_HOOK = os.environ.get('SLACK_HOOK') or None
+    GWDG_CHAT_API = os.environ.get('GWDG_CHAT_API') or ""
 
     # PRIVATE_APPS = os.environ.get('PRIVATE_APPS') or None