Merge pull request #1708 from emlys/bugfix/bump-pytest-subtests

bump pytest-subtests requirement

Author: davemfish

requirements-dev.txt

@@ -14,7 +14,7 @@
 
 virtualenv>=12.0.1
 pytest
-pytest-subtests
+pytest-subtests!=0.14.0  # https://github.com/pytest-dev/pytest-subtests/issues/173
 wheel>=0.27.0
 pypiwin32; sys_platform == 'win32'  # pip-only