finagle-opencensus-tracing: -> 2.13

[hderms]

Problem

No cross-build for finagle-opencensus-tracing 2.13

Solution

include 2.13 in finagle-opencensus-tracing cross versions.

[codecov-io]

Codecov Report

Merging #822 into develop will increase coverage by 1.06%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #822      +/-   ##
===========================================
+ Coverage    71.94%   73.01%   +1.06%     
===========================================
  Files          866      866              
  Lines        25184    25184              
  Branches      1823     1799      -24     
===========================================
+ Hits         18119    18387     +268     
+ Misses        7065     6797     -268

Impacted Files	Coverage Δ
...twitter/finagle/service/PendingRequestFilter.scala	86.36% <0%> (-4.55%)	⬇️
...r/finagle/dispatch/GenSerialClientDispatcher.scala	77.77% <0%> (-3.71%)	⬇️
...m/twitter/finagle/exp/ConcurrencyLimitFilter.scala	88.57% <0%> (-2.86%)	⬇️
...rtitioning/ConsistentHashPartitioningService.scala	88.63% <0%> (-2.28%)	⬇️
...tter/finagle/redis/protocol/commands/Streams.scala	97.5% <0%> (-1.25%)	⬇️
.../http/exp/GenStreamingSerialServerDispatcher.scala	77.08% <0%> (+6.25%)	⬆️
...gle/http2/transport/client/ClientServiceImpl.scala	90.9% <0%> (+9.09%)	⬆️
...gle/http2/transport/client/ClientSessionImpl.scala	90.9% <0%> (+11.36%)	⬆️
.../main/scala/com/twitter/finagle/mux/Response.scala	57.14% <0%> (+14.28%)	⬆️
...ter/finagle/zipkin/thrift/ScribeZipkinTracer.scala	41.66% <0%> (+41.66%)	⬆️
... and 12 more

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[yufangong]

This is merged fee83b1. Thanks for the patch!