Switch to @mole-inc/bin-wrapper

[peterbe]

Fixes #147

I'm not even sure how to run the tests locally, but let's see what .github/workflows/test.yml can make of this.

At least now, when I run...

❯ npm ls semver-regex
[email protected] /Users/peterbe/dev/JAVASCRIPT/gifsicle-bin
└─┬ @mole-inc/[email protected]
  └─┬ [email protected]
    └─┬ [email protected]
      └─┬ [email protected]
        └── [email protected]

I get a version of semver-regex that isn't known to be insecure.