OpenBSD (and others) support

[Superpat]

What is the current behaviour?
npm install -g preact-cli errors out on simplehttp2server post install step because the package only supports operating systems with pre-built binaries, I have built the binary myself yet cant download this package because of that error.

What is the expected behaviour?
For it to install properly, ideally I'd see either simplehttp2server fixing the error on their side or preact-cli switching for another dependency or offering a way to use a custom build of simplehttp2server.

Please mention other relevant information.

• Node version
  8.9.4
• npm version
  5.6.1
• Operating system
  OpenBSD-current (6.3 pre-release)
• CLI version
  not installed yet
• Browser
  firefox 59 (nightly)

[Superpat]

Issue I created in simplehttp2server.
1000ch/simplehttp2server#7

[Superpat]

This issue would be solved byt the following pull request kevva/bin-wrapper#56 so I'll close this issue for now.