Bump hupper from 1.4.2 to 1.5

Bumps [hupper](https://github.com/Pylons/hupper) from 1.4.2 to 1.5.
- [Release notes](https://github.com/Pylons/hupper/releases)
- [Changelog](https://github.com/Pylons/hupper/blob/master/CHANGES.rst)
- [Commits](Pylons/hupper@1.4.2...1.5)

Signed-off-by: dependabot[bot] <support@dependabot.com>

requirements.txt

@@ -8,7 +8,7 @@ colorama==0.4.1
 cornice==3.5.1
 cornice-swagger==0.7.0
 dockerflow==2018.4.0
-hupper==1.4.2
+hupper==1.5
 idna==2.8
 iso8601==0.1.12
 jsonpatch==1.23