Use key for list items in Tetrimino component #35
Use key for list items in Tetrimino component #35

+ Fix mixin name #35

pekala/cosmos,kidaa/cosmos,react-cosmos/react-cosmos,kwangkim/cosmos,rrarunan/cosmos,react-cosmos/react-cosmos,skidding/cosmos,cef62/cosmos,bbirand/cosmos,react-cosmos/react-cosmos,skidding/cosmos,teosz/cosmos,Patreon/cosmos,kidaa/cosmos,gdi2290/cosmos,Patreon/cosmos,bbirand/cosmos,teosz/cosmos,skidding/react-cosmos,rrarunan/cosmos,cef62/cosmos,gdi2290/cosmos,kwangkim/cosmos,pekala/cosmos,skidding/react-cosmos