Use Node 14 in base Docker image

[pkosiec]

• Use Node 14 in base Docker image
• Fix release script

[codecov]

Codecov Report

Merging #144 (9db2f4b) into master (b9d45b4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   93.43%   93.43%           
=======================================
  Files          18       18           
  Lines         274      274           
  Branches       49       49           
=======================================
  Hits          256      256           
  Misses          7        7           
  Partials       11       11           

Flag	Coverage Δ
cli	93.75% <ø> (ø)
core	93.33% <ø> (ø)

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