Implemented the title change to "✅Speed Test Completed" to alert the user in case of a Tab change by the user

[lakshay776]

• Implemented a title change to "✅Speed Test Completed" when the test is completed to notify the user of a test completion when they are on another tab
• This was done by checking if the document.hidden is true which checks if the user has opened the speed test tab or not
• if it is hidden then the title is changed otherwise it is rechecked and reverted to the original title

if (document.hidden) {
        var currentTitle = document.title;
        document.title = '✅ Speed Test Completed';
        document.addEventListener('visibilitychange', function onReturn() {
          if (!document.hidden) {
            document.title = currentTitle;
            document.removeEventListener('visibilitychange', onReturn);
          }
        });
      }

fixes #37

[lakshay776]

@robertodauria I have implemented the feature. Kindly review the PR and give your feedback!

[robertodauria]

Thanks for the contribution. Closing this as it is superseded by #83, which rewrites the codebase removing Angular, jQuery, Gulp, and the old app/ directory structure. The files modified by this PR either no longer exist after that change or the change has already been made.

We aim to merge #83 next week, which will give contributors a stable, modern base to work from. Thoughtful, targeted contributions that build on where the project is heading are much more valuable. We'd encourage you to review #83 and open any future PRs on top of that.