let -> const

[ytakashina]

yuya_takashina@y-takashina-so MINGW64 ~/Documents/Git/intro-repo/intro-curriculum-3006 (master)
$ bin/hubot
hubot-study> [Wed May 25 2016 16:36:54 GMT+0900 (東京 (標準時))] INFO C:\Users\yuya_takashina\Documents\Git\intro-repo\intro-curriculum-3006\scripts\hello.js is using deprecated documentation syntax
[Wed May 25 2016 16:36:54 GMT+0900 (東京 (標準時))] WARNING Loading scripts from hubot-scripts.json is deprecated and will be removed in 3.0 (https://github.com/github/hubot-scripts/issues/1113) in favor of packages for each script.

Your hubot-scripts.json is empty, so you just need to remove it.
[Wed May 25 2016 16:36:54 GMT+0900 (東京 (標準時))] ERROR hubot-heroku-alive included, but missing HUBOT_HEROKU_KEEPALIVE_URL. `heroku config:set HUBOT_HEROKU_KEEPALIVE_URL=$(heroku apps:info -s  | grep web-url | cut -d= -f2)`
[Wed May 25 2016 16:36:55 GMT+0900 (東京 (標準時))] INFO hubot-redis-brain: Using default redis on localhost:6379


hubot-study> lot>
hubot-study> lot>
hubot-study> 大吉, Shell