Support Node v10?

**Is your feature request related to a problem? Please describe.**
On Windows, it's a pain to have multiple Node versions, even with Windows version of `nvm` it means to constantly keep remembering to switch to a version since `.nvmrc` is not supported.

Node 10 is still [active LTS till April 2021](https://github.com/nodejs/Release#release-schedule). As such it's fair to expect many people will be still using it for some time.

**Describe the solution you'd like**
Is GuiJS depending on some specific features of Node 12? If not, can you lower this requirement to at least v10?

**Describe alternatives you've considered**
Since this is GUI application, using Windows Linux Subsystem won't do any good. I am not aware of any other approach.