Implement coverage measurement

[Diggsey]

No description provided.

[codecov-io]

Codecov Report

Merging #1 (90e5989) into master (89d6ba4) will increase coverage by 79.50%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master       #1       +/-   ##
===========================================
+ Coverage        0   79.50%   +79.50%     
===========================================
  Files           0        9        +9     
  Lines           0     1410     +1410     
===========================================
+ Hits            0     1121     +1121     
- Misses          0      289      +289     

Impacted Files	Coverage Δ
src/value.rs	73.12% <0.00%> (ø)
src/macros.rs	100.00% <0.00%> (ø)
src/lib.rs	100.00% <0.00%> (ø)
src/de.rs	49.23% <0.00%> (ø)
src/number.rs	76.79% <0.00%> (ø)
src/object.rs	83.41% <0.00%> (ø)
src/ser.rs	100.00% <0.00%> (ø)
src/string.rs	95.23% <0.00%> (ø)
src/array.rs	82.43% <0.00%> (ø)

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