feat(report): show file coverage with uncovered lines

[deniskorbakov]

Updated the display of uncovered rows - added a column with file coverage

Now the display looks like this:

File coverage threshold (100%) satisfied:       PASS
Total coverage threshold (100%) satisfied:      FAIL
Total test coverage: 98.5% (709/720)

Files with uncovered lines:
  file:                                         file coverage:  uncovered lines:
  pkg/testcoverage/badgestorer/github.go        43.8%           37-50 54 64-66 72-73 77-79
  pkg/testcoverage/path/path.go                 66.7%           16 24

close #235

[vladopajic]

merged! thanks