When serializing SpanModel, if there is any external modification of TAGS, it will lead to panic, add RLock before calling Send to prevent this error.

[php-lsys]

When serializing SpanModel, if there is any external modification of TAGS, it will lead to panic, add RLock before calling Send to prevent this error. issues:https://github.com/openzipkin/zipkin-go/issues/217

[jcchavezs]

LGTM

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (87e3b85) 66.83% compared to head (c8522fb) 69.29%. Report is 2 commits behind head on master.

Files	Patch %	Lines
span_implementation.go	66.66%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #218      +/-   ##
==========================================
+ Coverage   66.83%   69.29%   +2.45%     
==========================================
  Files          36       36              
  Lines        1770     2501     +731     
==========================================
+ Hits         1183     1733     +550     
- Misses        542      723     +181     
  Partials       45       45              

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