Estafette-gcloud-quota-exporter v1.2.4

Resolved issues (3)

• Build with golang 1.13.7. #10, @JorritSalverda
• Improve liveness probe to avoid frequent restarts. #9, @JorritSalverda
• Build with golang 1.13.6. #8, @JorritSalverda

See milestone 1.2.4 for more details.