Add note on termination

[morenoh149]

How to kill the test if it does not terminate after finishing.
Closes #54

[morenoh149]

@sindresorhus travis ci is failing here because you have a purposely failing test here https://github.com/sindresorhus/gulp-mocha/blob/master/fixture-fail.js#L5

[juanpabloaj]

@morenoh149 but, if I add process.exit(); this kill the gulp.watch command

[gregberge]

@morenoh149 how about the return code?

[gregberge]

The good way to do it is:

return gulp.src('test/**/*', {read: false})
  .pipe(mocha())
  .once('error', function () {
    process.exit(1);
  })
  .once('end', function () {
    process.exit();
  });

[morenoh149]

@neoziro @juanpabloaj submit a pull request :)

[gregberge]

@morenoh149 done #77