update CHANGE.md for 0.6.0

[AlexStocks]

What this PR does:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov-commenter]

Codecov Report

Merging #539 (8bdd901) into develop (484f451) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #539      +/-   ##
===========================================
- Coverage    54.73%   54.72%   -0.02%     
===========================================
  Files          666      666              
  Lines        77881    77881              
===========================================
- Hits         42629    42619      -10     
- Misses       31625    31633       +8     
- Partials      3627     3629       +2     

Impacted Files	Coverage Δ
pkg/istio-agent/xds_proxy_delta.go	46.11% <0.00%> (-9.85%)	⬇️
pilot/pkg/config/memory/monitor.go	71.79% <0.00%> (-7.70%)	⬇️
pkg/kube/inject/watcher.go	48.14% <0.00%> (-6.18%)	⬇️
samples/tcp-echo/src/main.go	69.69% <0.00%> (-6.07%)	⬇️
pkg/test/framework/resource/version.go	18.42% <0.00%> (-1.76%)	⬇️
pkg/kube/inject/inject.go	70.54% <0.00%> (-0.44%)	⬇️
pkg/kube/inject/webhook.go	70.83% <0.00%> (-0.38%)	⬇️
pilot/pkg/bootstrap/server.go	53.26% <0.00%> (+0.15%)	⬆️
pkg/istio-agent/agent.go	57.21% <0.00%> (+0.48%)	⬆️
pilot/pkg/model/jwks_resolver.go	79.06% <0.00%> (+0.77%)	⬆️
... and 5 more

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[mark4z]

LGTM