Fix lint and mypy #108

Job	Run time
opentelemetry-api	41s
opentelemetry-exporter-otlp-proto-common	48s
opentelemetry-getting-started	1m 3s
opentelemetry-opencensus-shim	49s
opentelemetry-opentracing-shim	42s
opentelemetry-proto	26s
opentelemetry-sdk	49s
opentelemetry-semantic-conventions	33s
opentelemetry-exporter-opencensus	39s
opentelemetry-exporter-otlp-combined	46s
opentelemetry-exporter-otlp-proto-grpc	52s
opentelemetry-exporter-otlp-proto-http	49s
opentelemetry-exporter-prometheus	39s
opentelemetry-exporter-zipkin-combined	41s
opentelemetry-exporter-zipkin-json	37s
opentelemetry-exporter-zipkin-proto-http	45s
opentelemetry-propagator-b3	42s
opentelemetry-test-utils	41s
opentelemetry-propagator-jaeger	38s
	13m 40s

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