Updated README with options.filter
Updated README with options.filter

krazylegz/grunt-cache-bust,mbenna/grunt-cache-bust,cgrail/grunt-cache-bust,ieb-josh/grunt-cache-bust-key,bhaskarmelkani/grunt-cache-bust-lazy-loading,dukai/grunt-cache-bust,mbenna/grunt-cache-bust,cgrail/grunt-cache-bust,dukai/grunt-cache-bust,ieb-josh/grunt-cache-bust-key,cgrail/grunt-cache-bust,mbenna/grunt-cache-bust,bhaskarmelkani/grunt-cache-bust-lazy-loading,krazylegz/grunt-cache-bust,tusbar/grunt-cache-bust,dukai/grunt-cache-bust,tusbar/grunt-cache-bust,clarkfbar/grunt-cachebust-plus,bhaskarmelkani/grunt-cache-bust-lazy-loading,yu521088/grunt-cachebust-plus,krazylegz/grunt-cache-bust,hollandben/grunt-cache-bust,hollandben/grunt-cache-bust