Change versioning scheme

[rickstaa]

First of all thanks a lot for the great action. Please allow me to throw in one suggestion. Maybe it is an idea to change the versioning scheme to include the v prefix? I think this is the convention used by official GitHub actions like the actions/checkout action. This will prevent confusion when users like me try to use the package based on a specific version:

- name: 'Get Previous tag'
  id: previous_tag
  uses: WyriHaximus/github-action-get-previous-tag@v1

Haya14busa provided a very handy action to make sure the major version tag points to the newest release. You can find it here.

related to #9

[WyriHaximus]

Sounds like a good idea @rickstaa ! Always struggled with how to set this up, but since this actions is available that would be very useful! Would you like creating the PR that introduces it?

[rickstaa]

@WyriHaximus Great! I just created #11. Let me know if you run into troubles.