我正在尝试构建此处的Slack应用：https://github.com/shaykalyan/slack-ascii
它构建成功，但在我尝试运行它时会提供此输出：
2018-02-14T16:21:18.323723+00:00 heroku[web.1]: Starting process with command `node index.js`
2018-02-14T16:21:20.151317+00:00 heroku[web.1]: State changed from starting to crashed
2018-02-14T16:21:20.137708+00:00 heroku[web.1]: Process exited with status 1
2018-02-14T16:21:20.085005+00:00 app[web.1]: /app/node_modules/request/node_modules/hawk/node_modules/boom/lib/index.js:5
2018-02-14T16:21:20.085023+00:00 app[web.1]: const Hoek = require('hoek');
2018-02-14T16:21:20.085025+00:00 app[web.1]: ^^^^^
2018-02-14T16:21:20.085027+00:00 app[web.1]: SyntaxError: Use of const in strict mode.
2018-02-14T16:21:20.085028+00:00 app[web.1]: at exports.runInThisContext (vm.js:73:16)
2018-02-14T16:21:20.085030+00:00 app[web.1]: at Module._compile (module.js:443:25)
2018-02-14T16:21:20.085032+00:00 app[web.1]: at Object.Module._extensions..js (module.js:478:10)
2018-02-14T16:21:20.085034+00:00 app[web.1]: at Module.load (module.js:355:32)
2018-02-14T16:21:20.085035+00:00 app[web.1]: at Function.Module._load (module.js:310:12)
2018-02-14T16:21:20.085037+00:00 app[web.1]: at Module.require (module.js:365:17)
2018-02-14T16:21:20.085038+00:00 app[web.1]: at require (module.js:384:17)
2018-02-14T16:21:20.085040+00:00 app[web.1]: at Object.<anonymous> (/app/node_modules/request/node_modules/hawk/lib/index.js:5:33)
2018-02-14T16:21:20.085042+00:00 app[web.1]: at Module._compile (module.js:460:26)
2018-02-14T16:21:20.085043+00:00 app[web.1]: at Object.Module._extensions..js (module.js:478:10)