bugfix: change command output from stderr to stdout when command exec…

[xcaspar]

…uted success

Does this pull request fix one issue?

See #123 for details

Describe how you did it

set output to stdout

Describe how to verify it

blade v | grep env

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@6073ef5). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #141   +/-   ##
=========================================
  Coverage          ?   15.22%           
=========================================
  Files             ?       55           
  Lines             ?     2712           
  Branches          ?        0           
=========================================
  Hits              ?      413           
  Misses            ?     2262           
  Partials          ?       37

Impacted Files	Coverage Δ
cli/cli.go	100% <100%> (ø)

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