v4.28-9669-beta (siomiz#62)

MAINT(all): v4.28-9669-beta

9668 (siomiz#57)

* Create CONTRIBUTORS.txt

* Update Dockerfile

* Update Dockerfile.alpine

* Update Dockerfile.debian

* Rename CONTRIBUTORS.txt to CONTRIBUTORS

* Update Dockerfile

* Update Dockerfile.alpine

* Update Dockerfile.debian

* CHORE(centos): 4.27-9668-beta

* CHORE(alpine): 4.27-9668-beta

* CHORE(debian): 4.27-9668-beta

* FIX(debian): add libssl to runtime

* FEAT(ubuntu): ubuntu:18.04 based

* TEST(ubuntu): expand travis ci to :ubuntu

* DOCS(all): Configurations section

closes siomiz#56

* DOCS(all): fix table

Update README.md