Fix TLS cert creation when Zones are added. (minio#115)

This PR revamps the main controller to look for changes
in MinIOInstance fields to respond to changes like
addition of zones, image updates.

Fixes minio#97

OLM 2.0.1 (minio#110)

* OLM 2.0.0

* Update version

simplify docker image build locally

Add goreleaser to release

k8s minimum is 1.15.5

fixes minio#45

Update image tag to latest release

Update to latest release

Change license to AGPL-3.0

Move to go1.13

Add travis builds