Incorrect conversion of UUIDs with Capital Letters

[oculus42]

Discovered while poking around Apple's HomeKit documentation, which uses capital letters in their UUIDs. Translation to flickrBase58 and back resulted in a different value:

Example:

const Short = require('short-uuid');
const hue = '00000013-0000-1000-8000-0026BB765291';
const hue_low = hue.toLowerCase();
const translator = Short();

let hUpper = translator.fromUUID(hue); // 2zMGpBQgCiDegNB6pP
let hLower = translator.fromUUID(hue_low); // 2zMGpBQgCiDen23yUa

console.log(hUpper, hLower, hUpper === hLower); // false;

let uUpper = translator.toUUID(hUpper); // 00000013-0000-1000-8000-0025ef765291
let uLower = translator.toUUID(hLower); // 00000013-0000-1000-8000-0026bb765291

console.log(uUpper, uUpper === hue || uUpper === hue_low); // false
console.log(uLower, uLower === hue || uLower === hue_low); // true

The fix is relatively simple: use .toLowerCase() before running through any-base.

A fix with unit tests is forthcoming.