Update kira.js
Update kira.js

Replacing utils.random() with getRandomInt() and fixing issue:

TypeError: Object #<Object> has no method 'random'
    at Api.getReferer (/root/tmp/node_modules/kira/lib/kira.js:238:13)
    at attack (/root/tmp/node_modules/kira/lib/kira.js:147:42)
    at wrapper [as _onTimeout] (timers.js:261:14)
    at Timer.listOnTimeout [as ontimeout] (timers.js:112:15)
chrisenytc/kira