Add example struct field init shorthand

[ghost]

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[rust-highfive]

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[Havvy]

Travis fails on stable and beta where field init shorthand syntax doesn't exist. It succeeds on nightly where it does. I'm presuming this patch will sit here until a release that has field init shorthand syntax in stable?

[steveklabnik]

Yes. Thanks @HnGiang ! We're gonna have to wait though.

[steveklabnik]

@hngnaig this syntax is now stable, can you remove the #![feature] stuff and then we can merge? Thanks!

[steveklabnik]

I've made the change. Thanks!