build(deps): Bump connexion from 2.4.0 to 2.5.0 in /backend (#330)

dependabot-preview[bot] · marco-c · commit ea2517cb97f7 · 2019-12-17T12:47:04.000+01:00
Bumps [connexion](https://github.com/zalando/connexion) from 2.4.0 to 2.5.0. - [Release notes](https://github.com/zalando/connexion/releases) - [Commits](spec-first/connexion@2.4.0...2.5.0) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
diff --git a/backend/requirements.txt b/backend/requirements.txt
@@ -1,5 +1,5 @@
 -e ../tools #egg=code-coverage-tools
-connexion==2.4.0
+connexion==2.5.0
 datadog==0.33.0
 fakeredis==1.1.0
 Flask==1.1.1
