Added ability to reload quota on SIGHUP (fixes #4)

[vania-pooh]

No description provided.

[codecov-io]

Codecov Report

Merging #10 into master will increase coverage by 3.22%.
The diff coverage is 69.23%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   25.53%   28.75%   +3.22%     
==========================================
  Files           2        2              
  Lines         141      153      +12     
==========================================
+ Hits           36       44       +8     
- Misses         99      103       +4     
  Partials        6        6

Flag	Coverage Δ
#unittests	28.75% <69.23%> (+3.22%)	⬆️

Impacted Files	Coverage Δ
ggr-ui.go	16.09% <0%> (-0.78%)	⬇️
main.go	45.45% <100%> (+7.52%)	⬆️

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