Fixes #1: Remove assigned ports from try-list

When a port is found, originating from the tryPorts-list, then all ports up to (and including) that port will be removed from the tryPorts-list.

I'm not 100% sure this is the best place to do this, but at the very least this might point others in the right direction.
Merge pull request #2 from RonaldTreur/patch-1

Fixes #1: Remove assigned ports from try-list