update readme
fixed method call in CronJob parameters

*
https://trello.com/c/DgDcHRhl/348-fix-hubot-planview-cronjob-to-fire-eve
ry-friday
Merge pull request #2 from thegarage/fix-cron-job

fix-cron-job
Merge branch 'master' of https://github.com/thegarage/hubot-planview into lets-be-honest

Conflicts:
	test/planview.js
Fix failing planview alert cron job test