Revert Pin coverage < 5 and parallel flag

setup.cfg

@@ -1,6 +1,5 @@
 [coverage:run]
 branch = True
-parallel = True
 source = cloudbridge
 omit =
   cloudbridge/interfaces/*

tox.ini

@@ -32,4 +32,4 @@ passenv =
     mock: CB_IMAGE_AWS CB_INSTANCE_TYPE_AWS CB_PLACEMENT_AWS AWS_ACCESS_KEY AWS_SECRET_KEY
 deps =
     -rrequirements.txt
-    coverage<5.0
+    coverage