Fix ENUM formatter to use string, not integer value.

[szmyd]

No description provided.

[codecov-commenter]

Codecov Report

Merging #159 (2b9f2c6) into master (45a5d6d) will decrease coverage by 0.45%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
- Coverage   63.19%   62.75%   -0.45%     
==========================================
  Files          68       68              
  Lines        4160     4159       -1     
  Branches      521      520       -1     
==========================================
- Hits         2629     2610      -19     
- Misses       1306     1323      +17     
- Partials      225      226       +1     

Components	Coverage Δ
AuthManager	100.00% <ø> (ø)
Cache	25.42% <ø> (-3.21%)	⬇️
FDS	68.30% <ø> (-0.13%)	⬇️
FileWatcher	55.90% <ø> (ø)
Flip	65.67% <ø> (ø)
gRPC	77.97% <ø> (ø)
Logging	29.41% <ø> (ø)
Metrics	80.20% <ø> (ø)
Options	100.00% <ø> (ø)
Setting	57.98% <ø> (ø)
StatusObject	73.83% <ø> (ø)
Utility	84.19% <ø> (ø)
Version	95.83% <ø> (ø)