Fix appveyor builds (#415)

sambhav · Nurdok · commit 4e39a57ccdf4 · 2019-10-21T19:36:02.000+03:00
diff --git a/requirements/tests.txt b/requirements/tests.txt
@@ -1,3 +1,3 @@
 pytest==3.0.2
 pytest-pep8==1.0.6
-mypy==0.630
+mypy==0.730
diff --git a/tox.ini b/tox.ini
@@ -7,6 +7,7 @@
 envlist = {py35,py36,py37}-{tests,install},py36-docs
 
 [testenv]
+download = true
 # Make sure reading the UTF-8 from test.py works regardless of the locale used.
 setenv =
     LANG=C
