add browser support

[codecov[bot]]

Codecov Report

Merging #45 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #45   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          11     10    -1     
  Lines         171    170    -1     
=====================================
- Hits          171    170    -1

Impacted Files	Coverage Δ
src/recorder.js	100% <ø> (ø)	:arrow_up:
src/platform/node/index.js	100% <ø> (ø)
src/tracer.js	100% <100%> (ø)	:arrow_up:
src/propagation/binary.js	100% <100%> (ø)	:arrow_up:

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[rochdev]

closes #37