Fix value calculation for input onchange event (#16)

heroku.yml

@@ -0,0 +1,5 @@
+build:
+    docker:
+        web: Dockerfile
+run:
+    web: yarn serve

src/modules/ui/input/input.js

@@ -26,7 +26,8 @@ export default class Input extends LightningElement {
 
     _checked = false;
 
-    changeHandler() {
+    changeHandler(event) {
+        this._value = this.calculateValue(event.target.value);
         this.dispatchEvent(new CustomEvent('change'));
     }