[PATCH 02 of 24 yams V2] [tox] add mypy

[Laurent Peuch]

# HG changeset patch
# User Laurent Peuch <cortex at worlddomination.be>
# Date 1579279651 -3600
#      Fri Jan 17 17:47:31 2020 +0100
# Node ID fadce0cbddeb3c003361d439be6a901e592d1042
# Parent  4a3921f215e07cbc3561ab87354462a1a7413b8a
# Available At https://hg.logilab.org/users/lpeuch/yams
#              hg pull https://hg.logilab.org/users/lpeuch/yams -r fadce0cbddeb
# EXP-Topic type_annotations
[tox] add mypy

diff --git a/tox.ini b/tox.ini
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist=py3,check-manifest,flake8
+envlist=py3,check-manifest,flake8,mypy
 
 [testenv]
 basepython=python3
@@ -28,3 +28,8 @@ exclude = docs/*,.tox/*
 
 [pytest]
 python_files = *test_*.py
+
+[testenv:mypy]
+deps =
+  mypy >= 0.761
+commands = mypy --ignore-missing-imports yams