chore: add spec for route globbing (#87)

feat(router/builder): string bodies should support "text/plain" mime

any route who can accept a string as the body should support "text/plain" mime so the request doesn't need to be JSON encoded

fix(open_api): required should be nil or true

the openapi spec says required should only be present if true

chore(open_api): strip whitespace on docs

feat(router/builder): allow overriding the OpenAPI type documentation

where you are calling `render` directly for some reason

chore(shard.yml): bump version

core(shard.yml): bump version

chore(error_handler): add support for latest exception_page

it has a breaking change crystal-loot/exception_page#49

fix(logger): add types for crystal 1.13 compat

fix(base): last modified check

the HTTP header ignores milliseconds which means we need to reduce the accuracy of the comparisons for exact matches