Fix development requirements: add pytest-cov and tox

diff --git a/requirements_dev.txt b/requirements_dev.txt
index 73c8ac6f99706acbcad1e859fdc54ffda340a5e1..ca2ff5d62c0481b2a56e73b65df745bfdd065c5b 100644 (file)
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,3 +1,5 @@
 -r requirements.txt
 
 pytest
+pytest-cov
+tox >= 1.8