Use slash as path separator on Windows

[vain0x]

This PR fixes the issue that inserted path contains \ (backslash) instead of / on Windows.

For example:

// latest (v0.3.2)
import * as AnotherLogics from "./logics\AnotherLogics";

// fixed
import * as AnotherLogics from "./logics/AnotherLogics";

[yukukotani]

Thanks for the contribution!

I believe you can just replace path.relative by path.posix.relative instead of manipulating string. Could you try it?

[vain0x]

Thanks! I changed the PR.

[yukukotani]

Thanks!

[yukukotani]

Released in https://github.com/yukukotani/typescript-plugin-namespace-import/releases/tag/v0.3.3