detect stale coverage reports
detect stale coverage reports

When the coverage report file is older than the file we're
showing the coverage report for, then we show a simple message
to state this fact.

magastzheng/go-mode.el,tjyang/go-mode.el,codemac/go-mode.el,dominikh/go-mode.el,gorakhargosh/go-mode.el,kimiby/go-mode.el,emacsmirror/go-mode,ibukanov/go-mode.el,artemave/go-mode.el