Fix "validate" vs "validator" name issue in docs

[th317erd]

Hello there!

When trying to use prompts, and copy + pasting from your own documentation, I ran into an exception thrown deep inside the prompts library:

Using your exact first example (or almost exact... I am using native ES6 modules):

import prompts from 'prompts';

(async () => {
  const response = await prompts({
    type: 'number',
    name: 'value',
    message: 'How old are you?',
    validate: value => value < 18 ? `Nightclub is 18+ only` : true
  });

  console.log(response); // => { value: 24 }
})();

This is the result:

? How old are you? › 23
    let valid = await this.validator(this.value);
                           ^

TypeError: this.validator is not a function
    at NumberPrompt.validate (.../node_modules/prompts/lib/elements/number.js:97:28)
    at NumberPrompt.submit (.../node_modules/prompts/lib/elements/number.js:106:16)
    at ReadStream.keypress (.../node_modules/prompts/lib/elements/prompt.js:32:16)
    at ReadStream.emit (node:events:515:28)
    at emitKeys (node:internal/readline/utils:371:14)
    at emitKeys.next (<anonymous>)
    at ReadStream.onData (node:internal/readline/emitKeypressEvents:64:36)
    at ReadStream.emit (node:events:527:35)
    at addChunk (node:internal/streams/readable:545:12)
    at readableAddChunkPushByteMode (node:internal/streams/readable:495:3)

Node.js v21.1.0

When I instead change the key to validator (vs validate as shown in the example) then everything works fine.

All tests are passing, so I made the assumption that it was the documentation that was wrong. If this assumption is incorrect please let me know. I find it odd that this has been around for 5 years without being reported? Is that correct? It concerns me that maybe I am missing context here.

Anyhow, I hope this helps. Accept or reject. I am just trying to help. :)