v0.5.1

Release notes

• Update to Go 1.16
• Removed old dependency on jackc/pgx from audit service and consolidated on jackc/pgx/v4 for all services
• App is now tested on Go 1.16, minikube v 1.18 and Kubernetes v1.20.2
• Added cpu request for Vault injected init containers when running app integrated with Vault in K8s
• Added details for Vault integration