Fixes failing mypy test by pinning pytest-mypy to 0.4.2 as suggested in issue #1328

Ludvig Kihlman · Ludvig Kihlman · commit 027a0d9f660b · 2020-05-07T14:03:15.000+01:00
diff --git a/dev-requirements.txt b/dev-requirements.txt
@@ -2,7 +2,7 @@ pytest>=4.5
 pytest-cov
 pytest-rerunfailures
 pytest-xdist
-pytest-mypy
+pytest-mypy==0.4.2
 coverage
 selenium
 sphinx
