Chrome deprecation warnings. What about the future?

[Olafxso]

Hi,

I am trying to work with gwt-polymer-elements. Therefore I followed the getting started tutorial.
I also checked you http://manolo.github.io/gwt-polymer-todo-list/demo/TodoListWidgets.html
The Chrome console has got some warnings:

todolistwidgets-0.js:572 [Deprecation] HTML Imports is deprecated and will be removed in M80, around February 2020. Please use ES modules instead. See https://www.chromestatus.com/features/5144752345317376 and https://developers.google.com/web/updates/2019/07/web-components-time-to-upgrade for more details.
zp @ todolistwidgets-0.js:572
sp @ todolistwidgets-0.js:554
tp @ todolistwidgets-0.js:461
Fj @ todolistwidgets-0.js:553
g @ todolistwidgets-0.js:508
Pb @ todolistwidgets-0.js:263
Sb @ todolistwidgets-0.js:352
eval @ todolistwidgets-0.js:373
vj @ todolistwidgets-0.js:509
eval @ todolistwidgets-0.js:583
(anonymous) @ VM8:1
m @ todolistwidgets.nocache.js:9
(anonymous) @ todolistwidgets.nocache.js:10
d @ todolistwidgets.nocache.js:6
[Deprecation] document.registerElement is deprecated and will be removed in M80, around February 2020. Please use window.customElements.define instead. See https://www.chromestatus.com/features/4642138092470272 and https://developers.google.com/web/updates/2019/07/web-components-time-to-upgrade for more details.
(anonymous) @ polymer-micro.html:449
(anonymous) @ polymer-micro.html:464
iron-shadow-flex-layout.html:12 This file is deprecated. Please use `iron-flex-layout/iron-flex-layout-classes.html`, and one of the specific dom-modules instead
(anonymous) @ iron-shadow-flex-layout.html:12
iron-flex-layout.html:14 This file is deprecated. Please use `iron-flex-layout/iron-flex-layout-classes.html`, and one of the specific dom-modules instead
(anonymous) @ iron-flex-layout.html:14
web-animations-bonus-object-form-keyframes.js:35 [Deprecation] /deep/ combinator is no longer supported in CSS dynamic profile. It is now effectively no-op, acting as if it were a descendant combinator. /deep/ combinator will be removed, and will be invalid at M65. You should remove it. See https://www.chromestatus.com/features/4964279606312960 for more details.
(anonymous) @ web-animations-bonus-object-form-keyframes.js:35
(anonymous) @ web-animations-bonus-object-form-keyframes.js:61
(anonymous) @ scope.js:19
[Violation] Forced reflow while executing JavaScript took 49ms

It said some methods will be removed in Februari 2020. Will there come an update for this?
I see this projects isn't chanced for almost 3 years now. Is it still maintained?