Lower future version for compatibility

Dan Richelson · Dan Richelson · commit 62ecd42ffcb9 · 2016-11-15T10:19:33.000-08:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,7 +1,7 @@
 backoff>=1.3.1
 CacheControl>=0.11.7
 requests>=2.11.1
-future>=0.16.0
+future>=0.15.2
 six>=1.10.0
 strict-rfc3339>=0.7
 jsonpickle==0.9.3
