Switch from outlines to ruler markers
Disable obtrusive error messages
Show status message instead of error
Show icon less briht color
Shows icon for each uncovered line
Python 3 support.
Support for custom colored marks.
Add support for .y files.
Merge pull request #1 from whitequark/master

Add Python3 support and custom colors for coverage marks
Remove commented code
Merge pull request #3 from sabotatore/master

Add less obtrusive coverage marks and Python 3 support