chore(requirements): update backoff to 1.4.3

mboersma · mboersma · commit 1fcf61bb7e33 · 2017-06-03T09:27:20.000-06:00
See https://github.com/litl/backoff/blob/master/CHANGELOG.md#v143---2017-05-22
diff --git a/rootfs/requirements.txt b/rootfs/requirements.txt
@@ -1,5 +1,5 @@
 # Deis controller requirements
-backoff==1.4.2
+backoff==1.4.3
 Django==1.11.2
 django-auth-ldap==1.2.12
 django-cors-middleware==1.3.1
