Update 0.19.3 changelog

Update changelog

Prepare for 0.18.4

Bump version

Bump version

Prepare for 0.16.7 release (knex#3190)

Prepare for 0.16.6 release (knex#3188)

* Bump version to 0.16.4

* Update changelog and bump version for 0.16.6 release

Bundle polyfills to prevent breaking existing Node 6 setups (knex#3140)

* Bump version to 0.16.4

* Hotfix polyfills for Node 6 in 0.16.5

* Remove unneeded upgrade instruction

Bundle polyfills to prevent breaking existing Node 6 setups (knex#3140)

* Bump version to 0.16.4

* Hotfix polyfills for Node 6 in 0.16.5

* Remove unneeded upgrade instruction

Update version in changelog (knex#3138)

* Bump version to 0.16.4

* Update changelog version