Dont increment semvertag patch level if last tag was already pre-release

Hi, 

Is there a way to not increment the patch level while using `{semvertag}` if the last tag was already a pre-release?

eg. while starting development on a v2.0.0 we might initially tag a pre-release as `v2.0.0-alpha`

Though if we then make a commit on the develop branch the semvertag will change to `v2.0.1-alpha-develop.1` rather than expected `v2.0.0-alpha-develop.1`