wrong requirement

when putting `2.2.x` in composer.lock, it gives me this error:
```
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - The requested package nicodmf/highlight-bundle 2.2.* could not be found.

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.
```

Maybe because branch 2.2.* does not exists? By putting `2.1.*` is working well
Merge pull request #5 from inmarelibero/patch-1

Right