recent update broke server-side rendering

[tennox]

Describe the bug
Upgrade from 1.0.4 to latest 1.1.1 (can bisect tomorrow) broke SSR:

ReferenceError: document is not defined
     at c (node_modules/vue-lazytube/dist/vue-lazytube.umd.min.js:2:83266)
     at v (node_modules/vue-lazytube/dist/vue-lazytube.umd.min.js:2:84526)
     at u (node_modules/vue-lazytube/dist/vue-lazytube.umd.min.js:2:83190)
     at t.exports (node_modules/vue-lazytube/dist/vue-lazytube.umd.min.js:2:84859)
     at assets/js/vendors~page--src--pages--index-vue.9796b736.js:13768:87012

To Reproduce
Steps to reproduce the behavior:

1. Use vue-lazytube in nodejs rendering
   (Can provide more details tomorrow)

Expected behavior
Working SSR.
Maybe it is out of scope for you and I have to disable it on server side, but would be great if not :)

[priverop]

The same happens in Nuxt 2.