Upgrade dependencies to io-ts-types 0.4.0

[Stéphane Le Dorze]

[Giulio Canti]

@sledorze fp-ts-routing is compatible with both versions (only NumberFromString is imported) so we could change to

"io-ts-types": "^0.3.6 || ^0.4.0"

right?

[Stéphane Le Dorze]

(Note: I did not know that was possible..)

[Stéphane Le Dorze]

Thanks!