feat: add ThumbnailOverlayEndorsement, #75

lib/parser/contents/classes/ThumbnailOverlayEndorsement.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const Text = require('./Text');
+
+class ThumbnailOverlayEndorsement {
+  type = 'ThumbnailOverlayEndorsement';
+  
+  constructor(data) {
+    this.text = new Text(data.text).toString();
+  }
+}
+
+module.exports = ThumbnailOverlayEndorsement;