changed content_type field to json

[mtrinh11]

No description provided.

[mtrinh11]

fixes #173

[codecov]

Codecov Report

Merging #189 (619dc57) into main (3df660f) will not change coverage.
The diff coverage is 50.00%.

❗ Current head 619dc57 differs from pull request most recent head e0eb667. Consider uploading reports for the commit e0eb667 to get more accurate results

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   56.89%   56.89%           
=======================================
  Files          17       17           
  Lines        1074     1074           
=======================================
  Hits          611      611           
  Misses        451      451           
  Partials       12       12           

Impacted Files	Coverage Δ
deviceStatus.go	49.27% <50.00%> (ø)

---

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 3df660f...e0eb667. Read the comment docs.