Serbia fixed and Kosovo added

[SabriHakuli]

I fixed Serbian map, removed Kosovo from their map and added Kosovo in their own map

[srivastava-anshul]

Hi admin
I want to ask if I can prebundle these maps in my app ?
What should I exactly put for giving credit to you ?
Users can insert the map in drawings then.

[SachinMeier]

Rwanda is also incorrectly the shape of Saudi Arabia.