add option for first line number to tag.js
add option for first line number to tag.js

zhipengyan/hexo,ppker/hexo,zhipengyan/hexo,kywk/hexi,hexojs/hexo,ppker/hexo,wangjordy/wangjordy.github.io,kywk/hexi,DevinLow/DevinLow.github.io,hexojs/hexo,leelynd/tapohuck,DevinLow/DevinLow.github.io,aulphar/hexo,amobiz/hexo,wangjordy/wangjordy.github.io,noikiy/hexo