Use pyupio to manage development dependencies

Oliver Sauder · Oliver Sauder · commit b36fc3e9e4db · 2018-10-25T08:38:13.000+02:00
This way CI doesn't suddently break when a dependency has updated
but we still keep up-to-date.

pyupio will open a PR with the updated dependencies.
diff --git a/.pyup.yml b/.pyup.yml
@@ -0,0 +1,5 @@
+search: False
+requirements:
+  - requirements-development.txt:
+      update: all
+      pin: True
