Support running git-clang-format on windows machines.

Summary

I am using Angular clang-format for formatting my C++ code used to build Node.js Native Addon. I want to support arm64 targets, and Angular clang-format only supports amd64 ones. I wanted to adopt git-clang-format in place of it as it bundles linux-arm64 and darwin-arm64 binaries (but not windows-arm64 which would also be highly appreciated).

I tried the following:

1. Add clang-format-git as dev dependency
2. Run npm i on windows machine

And got an error:

npm error command C:\WINDOWS\system32\cmd.exe /d /s /c test -d src && npm run build || npm run chmod
npm error > clang-format-git@1.2.3 chmod
npm error > find ./src/bin ./build/bin -type f -exec chmod 755 {} + || true
npm error 'test' is not recognized as an internal or external command,
npm error operable program or batch file.
npm error FIND: Parameter format not correct
npm error 'true' is not recognized as an internal or external command,
npm error operable program or batch file.

Details

The error originates from postinstall scripts, mainly from tail command || true. The error reproduces in both CMD and PowerShell. Current postinstall script runs successfully only in git-bash and WSL. But in my case I have to run npm i from Visual Studio Developer Console which is either CMD or PowerShell.

To fix the error || exit 0 could be used in place of || true as a windows-compatible alternative.

BTW I would highly appreciate if new version would be published to the npm registry after this change is merged, so I would be able to use this package :)

How did you test this change?

After the change I was able to successfully use package both from PowerShell and WSL.

Resolved Issues

Closes #170