Not needed to run tests.
https://github.com/box/flaky/issues/203

--- flaky-3.8.1/requirements-dev.txt.orig
+++ flaky-3.8.1/requirements-dev.txt
@@ -1,6 +1,5 @@
 -rrequirements.txt
 coveralls
-ordereddict
 pycodestyle
 pylint
 pytest