tidy up license related headers

[dcousens]

This code is so far from the Paul Johnston code, it actually seems misleading to hint at Version 2.2-beta.

[dcousens]

@calvinmetcalf should be ready to merge straight up

[dcousens]

Happy to ignore, I simply thought it was misleading ... 3 years ago.

[ljharb]

lol fair, and to be clear i'm not opposed to landing this - just trying to understand it.

[dcousens]

I think the intent was, with the current code reflecting so little of the original (see https://pajhome.org.uk/crypt/md5/sha256.html to compare with https://github.com/browserify/sha.js/blob/9b74ad04c1bdc28e557a85a30da3720f11fe33ca/sha256.js), it seemed appropriate to not imply that this code is representative of the other in respect to a code version et cetera.

However, the code is of course derived, which is important for attribution, but, it's in no way "Version 2.1a" or "Version 2.2-beta".

[ljharb]

gotcha. unfortunately since you deleted the fork there's no way to recover this PR :-( but if you think it's important and you wanted to open a new one (with some text more like "adapted from v2.whatever") then we can land that.

[dcousens]

I made the mistake of opening the cursed https://github.com/pulls

Maybe I'll open a new fork in a year or two