fix other refs to coverage

Author: wsanchez

tox.ini

@@ -193,7 +193,7 @@ basepython = python
 skip_install = True
 
 deps =
-    coverage==4.5.4
+    coverage==5.0.3
 
 commands =
     coverage combine
@@ -214,7 +214,7 @@ basepython = python
 skip_install = True
 
 deps =
-    coverage==4.5.4
+    coverage==5.0.3
     codecov==2.0.15
 
 commands =