Doesn't work with Sequelize

App works like a charm with `nodemon`.
When I try to run my app with `devtool`, `devtool` displays an error in Chrome Devtool console.

```
devtool bin/www --watch

[ERROR! bin/www] MySQL Connection ERROR: TypeError: Illegal invocation
at Sequelize.log (C:\Users\user\app\node_modules\sequelize\lib\sequelize.js:1338:21)
at Query.run (C:\Users\user\app\node_modules\sequelize\lib\dialects\mysql\query.js:36:20)
at C:\Users\user\app\node_modules\sequelize\lib\sequelize.js:843:20
at C:\Users\user\app\node_modules\retry-as-promised\index.js:38:21
at Promise._execute (C:\Users\user\app\node_modules\bluebird\js\release\debuggability.js:272:9)
at Promise._resolveFromExecutor (C:\Users\user\app\node_modules\bluebird\js\release\promise.js:475:18)
at new Promise (C:\Users\user\app\node_modules\bluebird\js\release\promise.js:77:14)
at retryAsPromised (C:\Users\user\app\node_modules\retry-as-promised\index.js:27:10)
at . (C:\Users\user\app\node_modules\sequelize\lib\sequelize.js:842:12)
at tryCatcher (C:\Users\user\app\node_modules\bluebird\js\release\util.js:16:23)
at Promise._settlePromiseFromHandler (C:\Users\user\app\node_modules\bluebird\js\release\promise.js:504:31)
at Promise._settlePromise (C:\Users\user\app\node_modules\bluebird\js\release\promise.js:561:18)
at Promise._settlePromise0 (C:\Users\user\app\node_modules\bluebird\js\release\promise.js:606:10)
at Promise._settlePromises (C:\Users\user\app\node_modules\bluebird\js\release\promise.js:685:18)
at Async._drainQueue (C:\Users\user\app\node_modules\bluebird\js\release\async.js:138:16)
at Async._drainQueues (C:\Users\user\app\node_modules\bluebird\js\release\async.js:148:10)
```