Update RELEASING.md (#4274) #39

Job	Run time
opentelemetry-api	39s
opentelemetry-proto-protobuf5	28s
opentelemetry-semantic-conventions	33s
opentelemetry-exporter-opencensus	38s
opentelemetry-exporter-otlp-proto-common	37s
opentelemetry-getting-started	52s
opentelemetry-opencensus-shim	36s
opentelemetry-opentracing-shim	39s
opentelemetry-sdk	42s
opentelemetry-exporter-otlp-combined	44s
opentelemetry-exporter-otlp-proto-grpc	41s
opentelemetry-exporter-otlp-proto-http	41s
opentelemetry-exporter-zipkin-combined	38s
opentelemetry-exporter-prometheus	36s
opentelemetry-exporter-zipkin-json	35s
opentelemetry-exporter-zipkin-proto-http	40s
opentelemetry-propagator-b3	32s
opentelemetry-propagator-jaeger	36s
opentelemetry-test-utils	35s
	12m 2s

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