Noticed this breakage while trying to install a plugin on 4.4.1-rc2.
```
> semver.default.satisfies("4.4.1-rc2", ">=4.3.0")
false
> semver.default.satisfies("4.4.1-rc2", ">=4.3.0", {includePrerelease: true})
true
```
Make `thelounge install file:~/path/to/package` work rather than
erroring out that the folder doesn't exists.
Probably funny on Windows, but it doesn't hurt either
