Installation Issue on Windows 10

```
$ npm i -g up

> up@1.0.1 postinstall C:\Users\___________\AppData\Roaming\npm\node_modules\up
> curl -sfL https://raw.githubusercontent.com/apex/up/master/install.sh | sh

sh: uname_os_check: internal error 'MINGW64_NT-10.0' got converted to 'mingw64_nt-10.0' which is not a GOOS value. Please file bug at https://github.com/client9/shlib
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! up@1.0.1 postinstall: `curl -sfL https://raw.githubusercontent.com/apex/up/master/install.sh | sh`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the up@1.0.1 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\___________\AppData\Roaming\npm-cache\_logs\2017-09-01T15_18_15_643Z-debug.log
```

I'm using Git Bash on Windows 10 Pro running on Hyper/ConEMU.