readme: reword the canonicalize_javascript_libraries note
readme: reword the canonicalize_javascript_libraries note

0x0mar/ngx_pagespeed,0x0mar/ngx_pagespeed,digideskio/ngx_pagespeed,wanrui/ngx_pagespeed,wanrui/ngx_pagespeed,pagespeed/ngx_pagespeed,digideskio/ngx_pagespeed,pagespeed/ngx_pagespeed