chore: adding metric observable to be able to support async update#964

Merged

dyladan merged 8 commits intoopen-telemetry:masterfrom obecny:metric_observable

Apr 22, 2020

+191-34

Commits on Apr 13, 2020

Commits on Apr 14, 2020

Merge branch 'master' into metric_observable
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Commits on Apr 15, 2020

Commits on Apr 22, 2020

chore: merge branch 'master' into metric_observable
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Merge branch 'metric_observable' of github.com:obecny/opentelemetry-js into metric_observable
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