Bump responses from 0.10.6 to 0.11.0

Bumps [responses](https://github.com/getsentry/responses) from 0.10.6 to 0.11.0.
- [Release notes](https://github.com/getsentry/responses/releases)
- [Changelog](https://github.com/getsentry/responses/blob/master/CHANGES)
- [Commits](getsentry/responses@0.10.6...0.11.0)

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

requirements-dev.txt

@@ -3,5 +3,5 @@
 coverage==4.5.3
 pytest==4.4.0
 pytest-cov==2.6.1
-responses==0.10.6
+responses==0.11.0
 coveralls==1.7.0