readme: fix numbering try 2
readme: fix numbering try 2

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