Only update new Pokemons etc

[darkeagl]

Checklist

• [x ] I have read the FAQ
• [ x] I have checked if this issue already exists (both open and closed issues)
• [ x] I am using the most recent version of pogom from the master branch
• [ x] If this is an installation issue, I am posting my OS, OS version, python version, pip version
• [ x] I'm posting the complete log
• [ x] I'm using a descriptive title for this issue

My Issue

Is it possible to implement this to the map?
https://github.com/PokemonGoMap/PokemonGo-Map/pull/1303

That would really help the bandwith etc. Thank you
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