Use Radix v0.4.0 (#596)
Use Radix v0.4.0 (#596)

Use latest release version of Radix in order to address some of the
routing bugs presented in previous versions of the dependency

See:

- luislavena/radix#23
- luislavena/radix#27
sdogruyol/kemal,sdogruyol/kemal,kemalcr/kemal