v0.2.1

This release has a new rewrite from version v0.1.x, the operator is based on kubebuilder as underlying SDK for writing k8s operators. This version contains all previous v0.1.x features, stability improvments, and minor bug fixing.

• Fixes bug when cluster is scaled down (#160 )
• Provides a way to delete PVC when cluster is deleted ( #73 ) ( thanks to @smanpathak )
• The PVCs has as owner reference the mysql cluster ( #79 )