Use customElements.define instead of document.registerElement

[ottok]

While using this plugin on Pulsar, I noticed the deprecation cop emitted the following warnings:

Use customElements.define instead of document.registerElement see https://javascript.info/custom-elements

HTMLDocument.registerElement - file:///opt/Pulsar/resources/app.asar/static/index.js:100:12
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/bottom-jobs-view.coffee:375:29](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/bottom-jobs-view.coffee:375:29)
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/bottom-jobs-view.coffee:380:4](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/bottom-jobs-view.coffee:380:4)
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/bottom-jobs-view.coffee:384:3](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/bottom-jobs-view.coffee:384:3)
Module._compile - [/opt/Pulsar/resources/app.asar/src/native-compile-cache.js:120:30](https://github.com/opt/Pulsar/resources/app.asar/src/native-compile-cache.js:120:30)
Object..coffee - [/opt/Pulsar/resources/app.asar/src/compile-cache.js:252:23](https://github.com/opt/Pulsar/resources/app.asar/src/compile-cache.js:252:23)
Use customElements.define instead of document.registerElement see https://javascript.info/custom-elements

HTMLDocument.registerElement - file:///opt/Pulsar/resources/app.asar/static/index.js:100:12
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/status-bar-view.coffee:299:29](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/status-bar-view.coffee:299:29)
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/status-bar-view.coffee:304:4](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/status-bar-view.coffee:304:4)
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/status-bar-view.coffee:308:3](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/status-bar-view.coffee:308:3)
Module._compile - [/opt/Pulsar/resources/app.asar/src/native-compile-cache.js:120:30](https://github.com/opt/Pulsar/resources/app.asar/src/native-compile-cache.js:120:30)
Object..coffee - [/opt/Pulsar/resources/app.asar/src/compile-cache.js:252:23](https://github.com/opt/Pulsar/resources/app.asar/src/compile-cache.js:252:23)
Use customElements.define instead of document.registerElement see https://javascript.info/custom-elements

HTMLDocument.registerElement - file:///opt/Pulsar/resources/app.asar/static/index.js:100:12
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/gitlab-repository-view.coffee:320:29](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/gitlab-repository-view.coffee:320:29)
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/gitlab-repository-view.coffee:325:4](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/gitlab-repository-view.coffee:325:4)
Object.<anonymous> - [/home/otto/.pulsar/packages/gitlab-manager/lib/gitlab-repository-view.coffee:329:3](https://github.com/home/otto/.pulsar/packages/gitlab-manager/lib/gitlab-repository-view.coffee:329:3)
Module._compile - [/opt/Pulsar/resources/app.asar/src/native-compile-cache.js:120:30](https://github.com/opt/Pulsar/resources/app.asar/src/native-compile-cache.js:120:30)
Object..coffee - [/opt/Pulsar/resources/app.asar/src/compile-cache.js:252:23](https://github.com/opt/Pulsar/resources/app.asar/src/compile-cache.js:252:23)