added missing env vars

Author: punasusi

README.md

@@ -18,7 +18,7 @@ a file called secrets.env with content:
 ```
 SLACK_NOTIFY_URL=<from slack>
 RANCHER_TOKEN=<bearer token for rancher user>
-RANCHER_URL=https://rancher.prms-tools.prod.gcp.veikkaus.fi/
+RANCHER_URL=http://rancher.cattle-system/v1/fleet.cattle.io.clusters/fleet-default
 CHECK_INTERVAL=60
 NOTIF_THRESHOLD=2
 ```

app.py

@@ -12,8 +12,10 @@
 
 
 SLACK_NOTIFY_URL = os.getenv('SLACK_NOTIFY_URL')
-RANCHER_URL = os.getenv('RANCHER_URL')
+RANCHER_URL = os.getenv('RANCHER_URL', default="http://rancher.cattle-system/v1/fleet.cattle.io.clusters/fleet-default")
 RANCHER_TOKEN = os.getenv('RANCHER_TOKEN')
+CHECK_INTERVAL = os.getenv('CHECK_INTERVAL', default=60)
+NOTIF_THRESHOLD = os.getenv('NOTIF_THRESHOLD', default=2)
 
 headersList = {
  "Accept": "application/json",