chore: update date for v0.4

[mayurkale22]

Which problem is this PR solving?

• Per SIG discussion, updating release date for v0.4.

[codecov-io]

Codecov Report

Merging #677 into master will increase coverage by 1.76%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #677      +/-   ##
==========================================
+ Coverage   89.78%   91.55%   +1.76%     
==========================================
  Files         213      216       +3     
  Lines       10105    10146      +41     
  Branches      932      917      -15     
==========================================
+ Hits         9073     9289     +216     
+ Misses       1032      857     -175

Impacted Files	Coverage Δ
...kages/opentelemetry-plugin-dns/test/utils/utils.ts	33.33% <0%> (-26.67%)	⬇️
...opentelemetry-core/src/trace/globaltracer-utils.ts	88.88% <0%> (-2.78%)	⬇️
...telemetry-core/src/context/propagation/B3Format.ts	94.59% <0%> (-1.41%)	⬇️
...core/src/context/propagation/BinaryTraceContext.ts	96.22% <0%> (-0.5%)	⬇️
packages/opentelemetry-plugin-dns/src/version.ts	100% <0%> (ø)	⬆️
...ges/opentelemetry-exporter-zipkin/src/transform.ts	100% <0%> (ø)	⬆️
packages/opentelemetry-plugin-redis/src/version.ts	100% <0%> (ø)	⬆️
...core/src/context/propagation/NoopHttpTextFormat.ts	100% <0%> (ø)	⬆️
...telemetry-plugin-grpc/test/utils/assertionUtils.ts	100% <0%> (ø)	⬆️
packages/opentelemetry-core/src/version.ts	100% <0%> (ø)	⬆️
... and 35 more

[dyladan]

I approved this, but I don't think we will have these things by the end of January...

[mayurkale22]

I approved this, but I don't think we will have these things by the end of January...

Totally agree, but this is better than the out-of-date (passed) and some known date to target for.