Support 0.18 & 0.19 knex

[leebickmtu]

I see that the peer dependency update to support knex 0.18 & 0.19 is merged in master but not release has been made. Could you please release that?

[jbrumwell]

@leebickmtu just checked npm and the latest 0.4.6 is on npm "peerDependencies": { "knex": "> 0.8 < 0.20" } . Are you experiencing issues with 0.4.6?

[leebickmtu]

Ok, looks like my issue may be something else then. Github is missing the release from its tags though, so you may want to add there as well.