Most notable things

You can now add any arbitrary HTTP method type as a route #2237

e.Add("COPY", "/*", func(c echo.Context) error 
  return c.String(http.StatusOK, "OK COPY")
})

You can add custom 404 handler for specific paths #2217

e.RouteNotFound("/*", func(c echo.Context) error { return c.NoContent(http.StatusNotFound) })

g := e.Group("/images")
g.RouteNotFound("/*", func(c echo.Context) error { return c.NoContent(http.StatusNotFound) })

Enhancements

• Add new value binding methods (UnixTimeMilli,TextUnmarshaler,JSONUnmarshaler) to Valuebinder #2127
• Refactor: body_limit middleware unit test #2145
• Refactor: Timeout mw: rework how test waits for timeout. #2187
• BasicAuth middleware returns 500 InternalServerError on invalid base64 strings but should return 400 #2191
• Refactor: duplicated findStaticChild process at findChildWithLabel #2176
• Allow different param names in different methods with same path scheme #2209
• Add support for registering handlers for different 404 routes #2217
• Middlewares should use errors.As() instead of type assertion on HTTPError #2227
• Allow arbitrary HTTP method types to be added as routes #2237