fix: Content-Type header for external_data request

[mrjoelkamp]

Fixes #191

Summary

• Set Content-Type header for external_data request

cc: @sozercan

Signed-off-by: Joel Kamp joel.kamp@invitae.com

[codecov-commenter]

Codecov Report

Merging #192 (523bf7e) into master (4ee2501) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
- Coverage   46.84%   46.82%   -0.02%     
==========================================
  Files          59       59              
  Lines        2818     2819       +1     
==========================================
  Hits         1320     1320              
- Misses       1254     1255       +1     
  Partials      244      244              

Flag	Coverage Δ
unittests	46.82% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...works/constraint/pkg/client/drivers/local/local.go	64.46% <0.00%> (-0.21%)	⬇️

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[sozercan]

Thank you! LGTM

[maxsmythe]

LGTM