fix: Print the name of the file with problems on the console

If verbose output is not enabled for Grunt, the file name was not written and the report could not be connected to it easily.

Author: prantlf

tasks/tidy-html5.js

@@ -80,6 +80,7 @@ module.exports = function (grunt) {
         .then(function (result) {
           const errors = result.errlog
           if (errors.length) {
+            grunt.log.writeln('Problems in "' + source + '":')
             grunt.log.write(errors)
             ++failed
           }