Merge branch 'master' into requires-io-master

Author: wsanchez

tox.ini

@@ -247,7 +247,8 @@ basepython = {[default]basepython}
 skip_install = True
 
 deps =
-    coverage==5.2.1
+    # coverage 5.0 drops Python 3.4 support
+    coverage==4.5.4  # rq.filter: <5
 
 setenv =
     {[default]setenv}