Clarify the interpretation of `SpanKind`#337

Merged

SergeyKanzhelev merged 6 commits intoopen-telemetry:masterfrom jmacd:jmacd/loosen_span_kind

Nov 4, 2019

+48-18

Commits on Oct 24, 2019

Loosen the SpanKind specification to allow string values
jmacd
committed

Commits on Oct 25, 2019

Updates
jmacd
committed
Updates
jmacd
committed
Updates
jmacd
committed

Commits on Oct 31, 2019

Merge branch 'master' into jmacd/loosen_span_kind
SergeyKanzhelev
authored

Commits on Nov 4, 2019

Update specification/api-tracing.md

jmacd
and
SergeyKanzhelev
authored