not returning error on 'unknown' runtime version anymore

[rockspore]

better resolves #18

Also, verbosef does not print "provisioning verified OK" unconditionally any longer.

[codecov]

Codecov Report

Merging #20 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   81.29%   81.31%   +0.01%     
==========================================
  Files           7        7              
  Lines        1021     1022       +1     
==========================================
+ Hits          830      831       +1     
  Misses        101      101              
  Partials       90       90              

Impacted Files	Coverage Δ
cmd/provision/config.go	87.93% <100.00%> (ø)
cmd/provision/provision.go	83.62% <100.00%> (+0.07%)	⬆️

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