v0.6.0
6bc91b9 Fix the flaky Jaeger exporter test
fd47890 Remove ToAggregation
b34c686 Keep pointer receiver name consistency
3e89604 Export trace attributes and annotations properly to Jaeger (#622)
b8f3b91 Span names shouldn't be prefixed with Sent and Recv (#616)
1f3b709 Replace aggregation types with functions (#608)
ce5da10 Fix plugin/ochttp statusCode mistype and unconditional set
854eae0 Note that custom instrumentation is optional (#617)
7b6adb7 Set SpanKind for HTTP and gRPC requests (#614)
0967e1d Introduce SpanKind support (#610)
3341038 Removed old Google propagation format package (#609)
e3a7a61 (aggregation) Add tests for gRPC span duration an Stackdriver gRPC exporting (#596)
b2a78ff Remove duplicate godoc and vanity URL enforcement (#605)
56bb98b Set status based on HTTP status code (#567)
c742c6f Fix the broken build (#606)
d1188f8 Support Jaeger agent export (#518)
283e903 Remove NoStats (#603)
2869e62 Add example for Zipkin exporter (#602)