Fix travis badge
Fix travis badge

It points at sourcelair/xterm.js and doesn't redirect
xtermjs/xterm.js,Tyriar/xterm.js,sourcelair/xterm.js,xtermjs/xterm.js,Tyriar/xterm.js,xtermjs/xterm.js,sourcelair/xterm.js,Tyriar/xterm.js,akalipetis/xterm.js,akalipetis/xterm.js,akalipetis/xterm.js,xtermjs/xterm.js,Tyriar/xterm.js,sourcelair/xterm.js,sourcelair/xterm.js,xtermjs/xterm.js,Tyriar/xterm.js,akalipetis/xterm.js