v3.0.0

• Major update to chi library with many exciting updates, but also some breaking changes
• URL parameter syntax changed from /:id to /{id} for even more flexible routing, such as /articles/{month}-{day}-{year}-{slug}, /articles/{id}, and /articles/{id}.{ext} on the same router
• Support for regexp for routing patterns, in the form of /{paramKey:regExp} for example: r.Get("/articles/{name:[a-z]+}", h) and chi.URLParam(r, "name")
• Add Method and MethodFunc to chi.Router to allow routing definitions such as r.Method("GET", "/", h) which provides a cleaner interface for custom handlers like in _examples/custom-handler
• Deprecating mux#FileServer helper function. Instead, we encourage users to create their own using file handler with the stdlib, see _examples/fileserver for an example
• Add support for LINK/UNLINK http methods via r.Method() and r.MethodFunc()
• Moved the chi project to its own organization, to allow chi-related community packages to be easily discovered and supported, at: https://github.com/go-chi
• NOTE: please update your import paths to "github.com/go-chi/chi"
• NOTE: chi v2 is still available at https://github.com/go-chi/chi/tree/v2