also output sha256 digest when generating certificate

[izolight]

The newkey and newcert endpoints now will print the sha256 digest in addition to md5 and sha1

[codecov-io]

Codecov Report

Merging #1063 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1063      +/-   ##
==========================================
+ Coverage    56.4%   56.42%   +0.01%     
==========================================
  Files          76       76              
  Lines        7256     7258       +2     
==========================================
+ Hits         4093     4095       +2     
  Misses       2697     2697              
  Partials      466      466

Impacted Files	Coverage Δ
api/generator/generator.go	33.97% <100%> (+0.85%)	⬆️

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[izolight]

I just went through my open PRs and saw that this is approved but not merged.
Anything in the way for a merge?