Update Lit to 0.6.2 (#1748)

package.json

@@ -34,7 +34,7 @@
     "@polymer/iron-media-query": "^3.0.1",
     "@polymer/iron-pages": "^3.0.1",
     "@polymer/iron-resizable-behavior": "^3.0.1",
-    "@polymer/lit-element": "^0.6.1",
+    "@polymer/lit-element": "^0.6.2",
     "@polymer/neon-animation": "^3.0.1",
     "@polymer/paper-button": "^3.0.1",
     "@polymer/paper-card": "^3.0.1",

src/components/buttons/ha-call-api-button.js

@@ -20,9 +20,6 @@ class HaCallApiButton extends LitElement {
     this.data = {};
     this.disabled = false;
     this.progress = false;
-    // Can be removed once this is merged:
-    // https://github.com/Polymer/lit-element/pull/244
-    this._buttonTapped = this._buttonTapped.bind(this);
   }
 
   static get properties() {