Hide version info if user has not defined version [v2]

[asahasrabuddhe]

Fixes #248 and #524

Changes

• Do not set default version
• HideVersion is now true if the user does not define flag

[codecov]

Codecov Report

Merging #955 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #955      +/-   ##
==========================================
- Coverage   73.37%   73.36%   -0.02%     
==========================================
  Files          32       32              
  Lines        2441     2440       -1     
==========================================
- Hits         1791     1790       -1     
  Misses        540      540              
  Partials      110      110

Impacted Files	Coverage Δ
app.go	76.98% <100%> (-0.1%)	⬇️

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