Reconsider default redirect code

[cllns]

Our default redirect is 301: Moved Permanently

router/lib/hanami/router.rb

Line 710 in 50826c9

DEFAULT_REDIRECT_CODE = 301

In browsers, this is often cached and it can be hard to break that cache. I think we should consider switching our default to 302: Found, which is a temporary redirect.

This is a breaking change so it'd have to be for a 3.0 release. The other option would be to keep 301 as the unconfigured default, then make this a configurable value, then generate new apps with the configuration set. But that seems like a lot of work for something so minor.