refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/livechat/UpdateViewershipAction.js

@@ -0,0 +1,17 @@
+'use strict';
+
+const Text = require('../Text');
+
+class UpdateViewershipAction {
+  type = 'UpdateViewershipAction';
+
+  constructor(data) {
+    const view_count_renderer = data.viewCount.videoViewCountRenderer;
+
+    this.view_count = new Text(view_count_renderer.viewCount);
+    this.extra_short_view_count = new Text(view_count_renderer.extraShortViewCount);
+    this.is_live = view_count_renderer.isLive;
+  }
+}
+
+module.exports = UpdateViewershipAction;