bootstrapDNS not used for upstream DNS resolution (#242)

[0xERR0R]

fixes #242

[codecov]

Codecov Report

Merging #246 (e7f3e2b) into development (7ea4b54) will decrease coverage by 0.06%.
The diff coverage is 45.23%.

@@               Coverage Diff               @@
##           development     #246      +/-   ##
===============================================
- Coverage        94.11%   94.04%   -0.07%     
===============================================
  Files               27       28       +1     
  Lines             2072     2084      +12     
===============================================
+ Hits              1950     1960      +10     
- Misses              91       94       +3     
+ Partials            31       30       -1     

Impacted Files	Coverage Δ
util/bootstrap.go	0.00% <0.00%> (ø)
cmd/root.go	61.53% <50.00%> (ø)
config/config.go	83.67% <66.66%> (-1.59%)	⬇️
resolver/upstream_resolver.go	88.11% <85.71%> (-0.18%)	⬇️
cmd/serve.go	100.00% <100.00%> (+31.14%)	⬆️

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