Upgrade to Crystal v0.30.0

[bcardiff]

A Crystal::VERSION check around URI.encode_www_form should be added if you want lucky to be warning free but also keep working in 0.29.0.

You can double-check in crystal-lang/crystal#7997 which encode/decode method applies better.

A couple of dependencies need to be updated also as stated in bcardiff@053b559 after each of them are released. Do not use my forks as dependencies.

• Annotate return types of abstract methods lucky_cli#379
• Update for Crystal v0.30.0 avram#176
• Upgrade dependencies for Crystal v0.30.0 cry#2
• Replace Void by Nil in return types dexter#8

There is one fix I notice along the way regarding distance_in_days.

Feel free to use as-is or close and use as a reference.

Thanks for all the specs that helped us discovering crystal-lang/crystal#8020 before releasing.

[jwoertink]

Awesome! Thanks for all your efforts!

[paulcsmith]

Thanks :D I removed the CLI and other mosop deps from paulcsmith/cry since we weren't using those libs anyway.

Rebased and added a new commit in #859