Bump flake8-docstrings from 1.0.3 to 1.7.0 (#41)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

test-requirements.txt

@@ -3,7 +3,7 @@ pylint==1.8.3
 pytest==3.4.2
 pytest-cov==2.5.1
 pytest-timeout==1.2.1
-flake8-docstrings==1.0.3
+flake8-docstrings==1.7.0
 flake8==3.5
 requests_mock==1.4
 testtools