v0.13b0

Nothing in changelog, but fixed breaking changes for OTel python v0.13b0.

v0.12b0

opentelemetry-exporter-google-cloud

• Add spankind support for trace exporter
  (#58)

v0.11b0

opentelemetry-exporter-google-cloud

• Add support for resources
  (#853)

opentelemetry-tools-google-cloud

• Add support for resources
  (#853)