Log Message:
py-coverage: updated to 5.3

Version 5.3:

The source setting has always been interpreted as either a file path or a \ 
module, depending on which existed. If both interpretations were valid, it was \ 
assumed to be a file path. The new source_pkgs setting can be used to name a \ 
package to disambiguate this case. Thanks, Thomas Grainger. Fixes issue 268.
If a plugin was disabled due to an exception, we used to still try to record its \ 
information, causing an exception, as reported in issue 1011. This is now fixed.