fix(tests): bump coverage library dependency to fix Python 3.8+

Signed-off-by: Romain Beuque <556072+rbeuque74@users.noreply.github.com>

Author: rbeuque74

setup.cfg

@@ -39,7 +39,7 @@ exclude =
 
 [options.extras_require]
 dev =
-    coverage==3.7.1
+    coverage>=5.0.3
     mock==1.0.1
     nose==1.3.3
     yanc==0.2.4
@@ -48,7 +48,7 @@ dev =
     setuptools>=30.3.0
     wheel
 test =
-    coverage==3.7.1
+    coverage>=5.0.3
     mock==1.0.1
     nose==1.3.3
     yanc==0.2.4