Not real vanilla js

[industral]

In source code you use _currentScript that actually polyfill stuff. And if it's not included component fail with an error. So renaming it to currentScript will fix it and made it real vanilla js web component.

[zenorocha]

Now we verify if currentScript is supported, if not we use _currentScript.

https://github.com/webcomponents/hello-world-element/blob/master/src/hello-world.html#L11

Thanks for pointing it out @industral!