Adding 'deprecated' to reqs

setup.py

@@ -22,7 +22,8 @@ REQS_BASE = [
     'bunch>=1.0.1',
     'six>=1.11',
     'tenacity>=4.12.0,<=5.0',
-    'cachetools>=2.1.0'
+    'cachetools>=2.1.0',
+    'deprecated>=1.2.3'
 ]
 REQS_AWS = ['boto3<1.8.0']
 # Install azure>=3.0.0 package to find which of the azure libraries listed