Update dependency @opencensus/core to ^0.0.16

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
@opencensus/core	dependencies	patch	^0.0.15 -> ^0.0.16

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Release Notes

census-instrumentation/opencensus-node

v0.0.16

Compare Source

• Feat, make tracer property available on spans.
• fix(span): make child span clock relative to root span (#​628)
• chore(deps): bump lodash from 4.17.11 to 4.17.13 (#​619)
• chore(deps): bump lodash in /packages/opencensus-instrumentation-http (#​624)
• chore(deps): bump lodash in /packages/opencensus-exporter-zpages (#​627)
• chore(deps): bump lodash in /packages/opencensus-propagation-stackdriver (#​621)
• chore(deps): bump lodash in /packages/opencensus-nodejs (#​620)
• chore(deps): bump lodash in /packages/opencensus-exporter-zipkin (#​626)
• chore(deps): bump lodash in /packages/opencensus-exporter-stackdriver (#​625)
• chore(deps): bump lodash in /packages/opencensus-instrumentation-https (#​623)
• chore(deps): bump lodash in /packages/opencensus-propagation-b3 (#​622)
• chore(deps): bump lodash in /packages/opencensus-core (#​618)
• chore(deps): bump lodash.template from 4.4.0 to 4.5.0 (#​617)

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