Pin azure_datalake_store to version 0.0.53

see #825

Author: winniehell

requirements/azure.txt

@@ -1,4 +1,6 @@
-azure-datalake-store >= 0.0.30
+# newer versions require changes to authentication
+# see https://github.com/nteract/papermill/issues/825
+azure-datalake-store >= 0.0.30,<1.0.0a0
 azure-storage-blob >= 12.1.0
 requests >= 2.21.0
 azure-identity>=1.3.1