Removed API key retrieval from config. (#78)

Author: Kevin Hellemun

tests/bunq_test.py

@@ -15,11 +15,9 @@ class BunqSdkTestCase(unittest.TestCase):
     :type _cash_register: endpoint.CashRegister
     """
 
+    # Error constants.
     __ERROR_COULD_NOT_DETERMINE_USER = 'Could not determine user alias.'
 
-    # Config values
-    _API_KEY = config.Config.get_api_key()
-
     # Name of bunq config file
     _FILENAME_BUNQ_CONFIG = "/bunq-test.conf"