Added example, fixed bug

Author: kormanowsky

example.js

@@ -0,0 +1,14 @@
+/**
+ * js-bit-list working example
+ * @author Mikhail Kormanowsky
+ */
+
+const BitList = require("./index");
+
+const MyBitList = BitList.useKeys(["myKey", "otherKey"]);
+
+let myBitListInstance = new MyBitList({myKey: true});
+
+console.log("It works!");
+console.log("Number", myBitListInstance.toNumber());
+console.log("myKey value", myBitListInstance.toObject().myKey);

index.js

@@ -195,6 +195,7 @@ class BitList {
           super(initialValue);
         } catch (error) {
           if (typeof initialValue === "object" && initialValue !== null) {
+            super(0);
             this.setObject(initialValue);
           } else {
             throw error;