Update db.js

scripts/core/db.js

@@ -1,8 +1,11 @@
 const nedb = require('nedb-promises')
+const fs = require('fs-extra')
 const file = require('./file')
 
 const DB_DIR = process.env.DB_DIR || './scripts/tmp/database'
 
+fs.ensureDirSync(DB_DIR)
+
 class Database {
   constructor(filepath) {
     this.filepath = filepath