Version 0.3.0

[martinthenth]

I have some changes ready and I'd like to release the recent changes made by @LukasKnuth:

1. Release Feature: Support validations on array items #50
2. Release Allow any Regex in :format option #53
3. Add :any field type and set it as default 🏗️
4. Remove defschema in favor of defparams 🏗️

Defaulting to :any would allow for proponents of the "check don't validate" parameter validation methodology to omit the types and simply check for presence. This change would make a breaking change for users of the basic syntax (not for the defparams users), because the current default is :string.

defschema is an earlier version of defparams that expands to the basic syntax. I'm not sure that anybody uses it anymore, because defparams is more convenient.

[martinthenth]

Applied in #55