update to redigo 1.8.9 (#83)

Merge pull request #82 from InVisionApp/github-ci-workflow

Adding GitHub action workflow for tests and vendor fix

Merge pull request #71 from unguiculus/fix-module

Fix module

Merge pull request #69 from InVisionApp/convert-to-modules

converted to modules

Merge pull request #58 from InVisionApp/complete-hook

Add OnComplete hook to health check config

Merge pull request #57 from maxcnunes/deps-pkgs

Move checkers with external deps into sub packages

Merge pull request #55 from InVisionApp/redis_tls

Adding option for TLS config in redis checker

Merge pull request #52 from helios-ag/memcached

Memcached

Merge pull request #51 from helios-ag/mongo

Simple Ping MongoDB Checker

Merge pull request #50 from endorama/fix-global-failed

Fix global failed status when multiple fatal checks have mixed results