remove string.prototype.padend dependency

[Pomax]

The string.prototype.padend dependency adds 3.,3 megabytes worth of deeply nesting dependencies (including a somewhat ridiculous 1MB worth of "test.html" in the object.assign sub-sub-dependency =) just to add something that's been supported by Node as far back as v8 =)

Normally, space on disk is irrelevant, but in this case it's 3.3 MB for a function that hasn't needed shimming for over five years now, and is supported by every LTS version including three EOL'ed versions =)

[luwes]

please let me know if you'd accept a new PR? I'm happy to help get this dependency removed...

[zloirock]

@luwes the last @mysticatea real activity on GitHub or other platforms that I was able to find is July 2021. All after that - only automatically created commits and merger his old PRs.

I hope that he is fine and just decided to relax.

My project depends on many of his packages and many (however not all) of them have maintained forks.

A maintained fork of this is https://github.com/bcomnes/npm-run-all2.