Remove opentracing from go.mod

[jpkrohling]

The PR #394 removed the opentracing interceptor, but missed cleaning it up from the go.mod.

The next step after this PR is to change the child modules to depend on the latest version, which should remove opentracing from their go.sum's.

Signed-off-by: Juraci Paixão Kröhling juraci@kroehling.de

[jpkrohling]

I just signed the CLA, would someone please trigger the check again?

[codecov-commenter]

Codecov Report

Merging #477 (8e96d1d) into v2 (6e2c2ac) will decrease coverage by 26.43%.
The diff coverage is 48.07%.

@@             Coverage Diff             @@
##               v2     #477       +/-   ##
===========================================
- Coverage   84.01%   57.58%   -26.44%     
===========================================
  Files          30       28        -2     
  Lines         932     1530      +598     
===========================================
+ Hits          783      881       +98     
- Misses        110      586      +476     
- Partials       39       63       +24     

Impacted Files	Coverage Δ
chain.go	0.00% <ø> (-90.91%)	⬇️
interceptors/auth/auth.go	100.00% <ø> (ø)
interceptors/auth/metadata.go	100.00% <ø> (ø)
interceptors/ratelimit/ratelimit.go	60.00% <0.00%> (-40.00%)	⬇️
interceptors/recovery/options.go	78.57% <ø> (ø)
testing/testpb/interceptor_suite.go	0.00% <0.00%> (ø)
testing/testpb/test.manual_validator.pb.go	0.00% <0.00%> (ø)
util/backoffutils/backoff.go	60.00% <ø> (ø)
util/metautils/single_key.go	60.00% <ø> (ø)
wrappers.go	66.66% <ø> (-33.34%)	⬇️
... and 22 more

---

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[bwplotka]

Thanks, amazing!

[bwplotka]

LGTM, thanks!