Fix env var name

MonsterAPIClient.py

@@ -89,7 +89,7 @@ MODELS_TO_DATAMODEL = {
 class MClient():
     def __init__(self):
         self.boundary = '---011000010111000001101001'
-        self.auth_token = os.environ.get('MONSTER_API_TOKEN')
+        self.auth_token = os.environ.get('MONSTER_API_KEY')
         self.headers = {
             "accept": "application/json",
             "content-type": f"multipart/form-data; boundary={self.boundary}",