Updated readme to specify browser support
Updated readme to specify browser support

Editandrew/particleground,raybesiga/particleground,sahithyen/particleground,Editandrew/particleground,chrismoulton/particleground,Renji/particleground,jnicol/particleground,itxd/particleground,raybesiga/particleground,marcomatteocci/particleground,Renji/particleground,chrismoulton/particleground,marcomatteocci/particleground,sahithyen/particleground,itxd/particleground