Add requirement tenacity

Jingjing Tang · Jingjing Tang · commit 65490cc4c79e · 2020-08-28T13:22:18.000-04:00
diff --git a/google_health/setup.py b/google_health/setup.py
@@ -11,7 +11,8 @@
     "delphi-utils",
     "covidcast",
     "boto3",
-    "moto"
+    "moto"，
+    "tenacity"
 ]
 
 setup(
