added requirements
added requirements

JackNokia/howdoi,godfreyy/howdoi,prasadph/howdoi,chrisspen/howdou,Xuefeng-Zhu/howdoi,zhengzhihust/howdoi,q1ang/howdoi,q1ang/howdoi,godfreyy/howdoi,chrisspen/howdou,zhengzhihust/howdoi,Xuefeng-Zhu/howdoi,jasonfellows/howdoi,prasadph/howdoi,stallman-cui/howdoi,gleitz/howdoi,kv9699/howdoi,allengaller/howdoi,kv9699/howdoi,allengaller/howdoi,nju520/howdoi,wujinbin/howdoi,stallman-cui/howdoi,jasonfellows/howdoi,wujinbin/howdoi,JackNokia/howdoi,gleitz/howdoi,nju520/howdoi