fix: improve settings parsing errors

[alexmt]

No description provided.

[codecov]

Codecov Report

Merging #84 into master will decrease coverage by 1.18%.
The diff coverage is 56.25%.

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
- Coverage   53.66%   52.48%   -1.19%     
==========================================
  Files          24       24              
  Lines        1295     1347      +52     
==========================================
+ Hits          695      707      +12     
- Misses        497      534      +37     
- Partials      103      106       +3     

Impacted Files	Coverage Δ
triggers/triggers.go	67.24% <56.25%> (-1.57%)	⬇️
notifiers/webhook.go	70.45% <0.00%> (-0.60%)	⬇️
notifiers/grafana.go	0.00% <0.00%> (ø)
notifiers/opsgenie.go	0.00% <0.00%> (ø)
notifiers/slack.go	22.80% <0.00%> (+2.80%)	⬆️

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