Broaden accepted values in non-urlencoded headers #46

Job	Run time
opentelemetry-api	41s
opentelemetry-exporter-opencensus	47s
opentelemetry-exporter-otlp-combined	48s
opentelemetry-exporter-otlp-proto-common	47s
opentelemetry-exporter-otlp-proto-grpc	54s
opentelemetry-exporter-otlp-proto-http	53s
opentelemetry-exporter-prometheus	42s
opentelemetry-exporter-zipkin-combined	43s
opentelemetry-exporter-zipkin-json	38s
opentelemetry-exporter-zipkin-proto-http	48s
opentelemetry-getting-started	1m 4s
opentelemetry-opencensus-shim	43s
opentelemetry-opentracing-shim	47s
opentelemetry-proto	27s
opentelemetry-sdk	56s
opentelemetry-semantic-conventions	41s
opentelemetry-propagator-b3	48s
opentelemetry-propagator-jaeger	41s
opentelemetry-test-utils	42s
	14m 30s

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