bump codecov from 2.0 to 2.1 in an attempt to fix client errors on upload from travis

Author: mahmoud

tox.ini

@@ -275,7 +275,7 @@ skip_install = True
 
 deps =
     {[testenv:coverage_report]deps}
-    codecov==2.0.22
+    codecov==2.1.4
 
 passenv =
     # See https://github.com/codecov/codecov-python/blob/master/README.md#using-tox