Get the older error if the new one does not exsist

Fixes: #2

scripts/knotctl

@@ -14,9 +14,12 @@ from urllib.parse import urlparse
 import argcomplete
 import requests
 import yaml
-from requests.exceptions import JSONDecodeError as RequestsJSONDecodeError
 from requests.models import HTTPBasicAuth
 from simplejson.errors import JSONDecodeError as SimplejsonJSONDecodeError
+try:
+    from requests.exceptions import JSONDecodeError as RequestsJSONDecodeError
+except ImportError:
+    from requests.exceptions import InvalidJSONError as RequestsJSONDecodeError
 
 
 # Helper functions