refactoring (#4)

functions/Roll.js

@@ -0,0 +1,15 @@
+const Random = require('random');
+const roll = (numberOfDice, numberOfEyes, tag) => {
+    let dice = [];
+    let sum = 0;
+    if(tag) {
+        Random.use(tag);
+    }
+    for (let i = 0; i<numberOfDice; i++ ) {
+        let result = Random.int(1,numberOfEyes);
+        dice.push(result);
+        sum += result;
+    }
+    return { dice, sum };
+};
+module.exports = { roll };