Update LICENSE.md
Update LICENSE.md

Switched from GPLv3 to MPLv2
as02700/adarkroom,bdorer/adarkroom,snazzysanoj/snazzysanoj.github.io,Pioneer11X/adarkroom,acutesoftware/adarkroom,ChapmanCPSC370/adarkroom,kaisyu/adarkroom,doublespeakgames/adarkroom,doublespeakgames/adarkroom,purplemilk/adarkroom,ikoan/adarkroom,kaisyu/adarkroom,Continuities/adarkroom,tehp/adarkroom,marty13612/darkroom,pablo-new17/adarkroom,fsladkey/adarkroom,bdorer/adarkroom,marty13612/darkroom,acutesoftware/adarkroom,sbakht/adarkroom,snazzysano/snazzysano.github.io,Continuities/adarkroom,kaisyu/adarkroom,pandaofpie/adarkroom,Bleyddyn/adarkroom,snazzysano/adarkroom,snazzysanoj/snazzysanoj.github.io,snazzysano/adarkroom,gerred/adarkroom,doublespeakgames/adarkroom,tehp/adarkroom,as02700/adarkroom,Tedko/adarkroom,DDReaper/adarkroom,purplemilk/adarkroom,Tedko/adarkroom,Pioneer11X/adarkroom,Razynoir/adarkroom,akfish/adarkroom,gerred/adarkroom,asteri0n/adarkroom,asteri0n/adarkroom,snazzysano/snazzysano.github.io,crafteverywhere/adarkroom,homeofmatt/play_adarkroom,ngosang/adarkroom,doublespeakgames/adr-desktop,Razynoir/adarkroom,crafteverywhere/adarkroom,pablo-new17/adarkroom,ikoan/adarkroom,fsladkey/adarkroom,JamesKent/adarkroom,sbakht/adarkroom,DDReaper/adarkroom,ngosang/adarkroom,JamesKent/adarkroom,snazzysanoj/snazzysanoj.github.io,Bleyddyn/adarkroom