switched nedb to nedb-promises (#37)

* breaking change: switched to nedb-promises
* Linting
* some dev dependencies
* more tests
* updated package version
* bug fixing
* changed isNaN to isString
* (fix) args[0]

functions/Roll.js

@@ -1,18 +1,17 @@
-const { Random } = require("@dsabot/Random");
+const { Random } = require('@dsabot/Random');
 //const Random = require('random');
 
 const roll = (numberOfDice, numberOfEyes, tag) => {
-    let dice = [];
+    const dice = [];
     let sum = 0;
-    if(tag) {
+    if (tag) {
         Random.use(tag);
     }
-    for (let i = 0; i<numberOfDice; i++ ) {
-        let result = Random.int(1,numberOfEyes);
+    for (let i = 0; i < numberOfDice; i += 1) {
+        const result = Random.int(1, numberOfEyes);
         dice.push(result);
         sum += result;
     }
     return { dice, sum };
 };
 module.exports = { roll };
-