Update src/lib/updating-element.ts
Update src/lib/updating-element.ts

Co-Authored-By: Kevin Schaaf <9a257b3f383b9c356dd073edb09b41a7944a59ed@google.com>
lit/lit-element,Polymer/lit-element,Polymer/lit-element,Polymer/lit-element,lit/lit-element,lit/lit-element