v0.21.0

Implemented enhancements:

• Use S3 compatible bucket #72
• Update to terraform v0.12.28 #98 (mhaley-miovision)
• Add AWS ARN Support #95 (fafalafafa)
• GCS support #91 (tristanvanthielen)
• Add optional AWS endpoint #81 (raphink)

Closed issues:

• panic: runtime error: invalid memory address or nil pointer dereference #90