Update Jaeger community support URL

[albertteoh]

Signed-off-by: albertteoh [email protected]

Which problem is this PR solving?

From Gitter -> Slack.

URL obtained by right-clicking #jaeger channel -> "Copy link".

[codecov]

Codecov Report

Merging #2868 (099a2e0) into master (bcda38b) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2868      +/-   ##
==========================================
+ Coverage   95.94%   95.95%   +0.01%     
==========================================
  Files         223      223              
  Lines        9675     9675              
==========================================
+ Hits         9283     9284       +1     
- Misses        323      324       +1     
+ Partials       69       67       -2     

Impacted Files	Coverage Δ
pkg/config/tlscfg/cert_watcher.go	92.20% <0.00%> (-2.60%)	⬇️
plugin/storage/integration/integration.go	77.34% <0.00%> (-0.56%)	⬇️
plugin/storage/badger/spanstore/reader.go	96.08% <0.00%> (+0.71%)	⬆️
cmd/query/app/static_handler.go	96.77% <0.00%> (+1.61%)	⬆️

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[yurishkuro]

There's more than one reference:

./README.md:4:[![Gitter chat][gitter-img]][gitter]
./README.md:166: * [Gitter chat room](https://gitter.im/jaegertracing/Lobby)
./README.md:197:[gitter]: https://gitter.im/jaegertracing/Lobby
./README.md:198:[gitter-img]: https://img.shields.io/badge/gitter-join%20chat%20%E2%86%92-brightgreen.svg
./RELEASE.md:25:6. Announce the release on the [mailing list](https://groups.google.com/g/jaeger-tracing), [gitter](https://gitter.im/jaegertracing/Lobby), and [twitter](https://twitter.com/JaegerTracing?lang=en).
./.github/ISSUE_TEMPLATE/feature_request.md:17:    - our chat room https://gitter.im/jaegertracing/Lobby, or
./.github/ISSUE_TEMPLATE/config.yml:4:    url: https://gitter.im/jaegertracing/Lobby
./SECURITY.md:18:* Contact us on our open chat room on [Gitter][gitter-room]
./SECURITY.md:19:* If you can't use Gitter, send a message to [[email protected]][mailing-list]
./SECURITY.md:20:* If you can't use Gitter nor send an email, open a merge request on GitHub: fork the affected repository and send us a pull request. We really prefer if you'd talk to us before, though, as our repositories are public and we would like to give a heads up to our users before disclosing it publicly
./SECURITY.md:94:[gitter-room]: https://gitter.im/jaegertracing/Lobby

See also jaegertracing/documentation#478

[albertteoh]

Thanks for pointing that out @yurishkuro, I'll update those other refs too.

[jpkrohling]

Related to this: jaegertracing/documentation#478

[jpkrohling]

Apparently, there's still one reference left:

./idl/.github/ISSUE_TEMPLATE.md:    - our chat room https://gitter.im/jaegertracing/Lobby, or

[albertteoh]

Apparently, there's still one reference left:

./idl/.github/ISSUE_TEMPLATE.md:    - our chat room https://gitter.im/jaegertracing/Lobby, or

@jpkrohling I think idl is a submodule pointing to another repo: https://github.com/jaegertracing/jaeger-idl and so I'll need to create a separate PR there, along with jaeger-ui. I'll create an issue ticket to track what needs to change.

[jpkrohling]

Yes, sorry, not enough coffee today. LGTM