Updating bytes variable with random values.

[NoorAhmed407]

Why.

I was working on a platform where crypto was not there in the global object, the polyfill was returning a new array instead mutating the array that is already there in the parameter. In that case uuid function was returning "0000000-0000-4000-8000-000000000000" every time because of

crypt0.getRandomValues(bytes);
          return bytes;

Raising a fix for this.