change to single quote strings

nice work dude!

It would be great if the use of single or double quotes strings could be normalized.

IMO, all to single quotes, so we can set a good start point for beginners. Indeed you recommend https://github.com/feross/standard which states the single quote style.

Rules

2 spaces – for indentation
Single quotes for strings – except to avoid escaping

for example from

var firstCat = { name: "bill", lastName: "the cat", address: "The Alley" }

to

var firstCat = { name: 'bill', lastName: 'the cat', address: 'The Alley' }

If you like the idea, I'll be glad to help with the change and make a PR.

Inspecciona los ejemplos de JavaScript del repositorio y compara el uso de comillas en sus cadenas con el estilo solicitado de comillas simples. Normaliza los ejemplos aplicables, conservando las comillas dobles cuando así se evitaría el escape, y luego verifica que los fragmentos documentados sigan de forma coherente la regla indicada.