Build both go-1.14 and go-1.15 in circleci with new custom executors (#351)
Build both go-1.14 and go-1.15 in circleci with new custom executors (#351)


open-telemetry/opentelemetry-go-contrib,open-telemetry/opentelemetry-go-contrib,open-telemetry/opentelemetry-go-contrib