Fix usage of propagation headers config

[isaachier]

Signed-off-by: Isaac Hier [email protected]

[codecov]

Codecov Report

Merging #91 into master will increase coverage by 0.86%.
The diff coverage is 85.18%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   88.18%   89.05%   +0.86%     
==========================================
  Files          96       96              
  Lines        2311     2321      +10     
==========================================
+ Hits         2038     2067      +29     
+ Misses        273      254      -19

Impacted Files	Coverage Δ
src/jaegertracing/Tracer.h	87.36% <100%> (+1.05%)	⬆️
src/jaegertracing/SpanContext.h	98.5% <100%> (+0.04%)	⬆️
src/jaegertracing/propagation/Propagator.h	95.65% <75%> (+13.34%)	⬆️
src/jaegertracing/metrics/Metrics.h	89.13% <0%> (+2.17%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a6a313d...b925bee. Read the comment docs.

[isaachier]

Despite the minor coverage issue that I cannot figure out, I'm merging this.