fix(deps): update dependency @opencensus/propagation-stackdriver to v0.0.20

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
@opencensus/propagation-stackdriver	dependencies	patch	0.0.19 -> 0.0.20

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Release Notes

census-instrumentation/opencensus-node

v0.0.20

Compare Source

• fix(resources): GKE pod name label (#​728)
• chore: update dependency grpc to 1.24.2 (#​750)
• fix: core version (#​753)
• chore(deps): bump handlebars (#​719)

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[codecov]

Codecov Report

Merging #1199 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1199      +/-   ##
==========================================
- Coverage   94.74%   94.69%   -0.05%     
==========================================
  Files          99       99              
  Lines        6543     6482      -61     
  Branches      514      514              
==========================================
- Hits         6199     6138      -61     
  Misses        181      181              
  Partials      163      163

Impacted Files	Coverage Δ
test/web-frameworks/connect.ts	76.92% <0%> (-0.86%)	⬇️
test/test-cls-ah.ts	90.12% <0%> (-0.69%)	⬇️
test/web-frameworks/hapi17.ts	92.3% <0%> (-0.38%)	⬇️
test/web-frameworks/hapi8_16.ts	90.47% <0%> (-0.23%)	⬇️
test/test-grpc-async-handler.ts	97.01% <0%> (-0.17%)	⬇️
test/test-trace-web-frameworks.ts	98.72% <0%> (-0.12%)	⬇️
test/plugins/test-cls-bluebird.ts	96.77% <0%> (-0.11%)	⬇️
test/test-trace-hapi-tails.ts	97.91% <0%> (-0.09%)	⬇️
test/trace.ts	93.5% <0%> (-0.09%)	⬇️
test/test-config-priority.ts	96% <0%> (-0.08%)	⬇️
... and 3 more

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