Not rely on CI=true for TTY check

[felipecrs]

Fixes #2638

[codecov]

Codecov Report

Merging #2639 (92ccf32) into develop (994a0e6) will increase coverage by 0.79%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #2639      +/-   ##
===========================================
+ Coverage    90.85%   91.65%   +0.79%     
===========================================
  Files           21       21              
  Lines         1105     1102       -3     
  Branches       334      333       -1     
===========================================
+ Hits          1004     1010       +6     
+ Misses         101       92       -9     

Flag	Coverage Δ
cli	82.39% <100.00%> (-0.05%)	⬇️
integration	42.37% <0.00%> (+0.11%)	⬆️
library	60.70% <0.00%> (+0.16%)	⬆️
unit	77.67% <100.00%> (+0.84%)	⬆️

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Impacted Files	Coverage Δ
lib/reporters/cli/cli-utils.js	81.08% <100.00%> (-0.50%)	⬇️
bin/newman.js	89.79% <0.00%> (-0.41%)	⬇️
lib/print/index.js	98.27% <0.00%> (+15.51%)	⬆️

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