Remove pnpm requirements

[wSedlacek]

It appears that pnpm is requires to use this package and by extension ts-import, it would be nice if this wasn't the case.

error nx-tools/node_modules/ts-options-defaults: Command failed.
Exit code: 1
Command: npx only-allow pnpm
Arguments: 
Directory: nx-tools/node_modules/ts-options-defaults
Output:
npx: installed 26 in 2.143s
Opening `/dev/tty` failed (6): Device not configured
╔═════════════════════════════════════════════════════════════╗
║                                                             ║
║   Use "pnpm install" for installation in this project.      ║
║                                                             ║
║   If you don't have pnpm, install it via "npm i -g pnpm".   ║

[radarsu]

I'll publish new version with a fix as soon as possible.

For now you could remove:

    "scripts": {
        "preinstall": "npx only-allow pnpm"
    }

From node_modules/ts-options-defaults/package.json and node_modules/ts-import - let me know if without preinstall script there are no further problems.

EDIT:
I've published prerelease version ts-import@0.0.34-4 which uses fixed ts-options-defaults@0.0.34-3. Let me know if it works. Later on I'll do some tests to ensure library works with all major package managers: npm, yarn, and pnpm.
Just to avoid confusion - changes are not yet pushed to github (just to npm).