fix(node-renderer): [hidden] alias as [attr.hidden] (#629)
fix(node-renderer): [hidden] alias as [attr.hidden] (#629)

You no longer need to use `[attr.hidden]`, `[hidden]` can be used like
normally suggested in Angular docs.

Tested with Boolean (true|false), and String|emptyString.

Closes #612
ufo-github/universal,ufo-github/universal,ufo-github/universal,angular/universal,angular/universal,angular/universal,angular/universal