If a single country is used, neither highColor nor lowColor does is set.

[femlingen]

1. The single country use will be set to defaultCountryFillColor.
2. +1 on the issue with the hover problem. Suggestion: call onHoverLeaveCountry() when position is not over any country.

[maguayo]

I'm currently working full time on a project and have little time to maintain this. Feel free to do any changes you want. I'll gladly accept the PR