Pin urllib3 to fix travis builds (#287)

fabianvf · fabianvf · commit 26b3c6927f3e · 2019-04-25T11:10:53.000-04:00
(cherry picked from commit 5d86bf5)
diff --git a/requirements.txt b/requirements.txt
@@ -1,6 +1,7 @@
 dictdiffer
 jinja2
 kubernetes >= 8.0.0, < 9.0.0
+urllib3 < 1.25
 python-string-utils
 ruamel.yaml >= 0.15
 six
