Use ? instead of unwrap in examples

[KodrAus]

Relevant API guidelines

Replace uses of .unwrap in examples with ? so they're a bit more idiomatic. Have a look at the API guideline examples for some ideas on how to do this.

[jansol]

I'm interested in working on this

[jansol]

...or not, it seems.

[KodrAus]

Oh sorry about that @jansol! Are there any other issues here you'd be interested in taking on?

[jansol]

No problem. Nothing has caught my eye yet, but I haven't looked very thoroughly yet.

[anna-liao]

oh woops, just noticed that it's in progress at #144 Will look for something else :)

[KodrAus]

@anna-liao No problem! There are plenty of other issues here and in semver-parser too. If you can't find anything you like the look of also feel free to reach out on gitter.

[apopiak]

#160 resolves this, correct?