Update CHANGELOG.md

[eyalkoren]

No description provided.

[felixbarny]

Add "Align default transaction name to ' unknown route' (#542)". Maybe even to potentially breaking changes.

[codecov-io]

Codecov Report

Merging #546 into master will decrease coverage by 2.2%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master   #546      +/-   ##
==========================================
- Coverage     65.21%    63%   -2.21%     
  Complexity       68     68              
==========================================
  Files           180    180              
  Lines          7189   6796     -393     
  Branches        860    776      -84     
==========================================
- Hits           4688   4282     -406     
- Misses         2252   2256       +4     
- Partials        249    258       +9

Impacted Files	Coverage Δ	Complexity Δ
.../apm/agent/report/serialize/DslJsonSerializer.java	81.84% <0%> (-6.41%)	0% <0%> (ø)
...pm/agent/report/IntakeV2ReportingEventHandler.java	76.23% <0%> (-5.15%)	0% <0%> (ø)
...tic/apm/agent/configuration/CoreConfiguration.java	95.94% <0%> (-2.25%)	0% <0%> (ø)
...a/co/elastic/apm/agent/report/ReporterFactory.java	78.26% <0%> (-0.91%)	0% <0%> (ø)
.../main/java/co/elastic/apm/agent/impl/MetaData.java	100% <0%> (ø)	0% <0%> (ø)	⬇️

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