Update dependency @opencensus/core to ^0.0.13

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
@opencensus/core	dependencies	patch	^0.0.12 -> ^0.0.13

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Release Notes

census-instrumentation/opencensus-node

v0.0.13

Compare Source

• Exporter/Stats/Prometheus: Fix missing tags for HTTP metrics
• http-instrumentation: add support for the addition of custom attributes to spans
• Set CurrentRootSpan correctly
• Chore: update GRPC to 1.12.3
• Fix: handle infinite loop caused by get traceState()
• Chore: upgrade engines field to >=8
• Chore: Fix js-yaml vulnerability from Codecov
• Change CLS import to do stats type more general

This release has a breaking change. Please test your code accordingly after upgrading.

• Remove Span's startChildSpan(nameOrOptions?: string|SpanOptions, kind?: SpanKind) interface, now only SpanOptions object interface is supported.

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