Add Version option as a convenience wrapper for version parser

[grochefort]

No description provided.

[codecov]

Codecov Report

Merging #95 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   94.85%   94.94%   +0.08%     
==========================================
  Files           2        2              
  Lines         680      692      +12     
==========================================
+ Hits          645      657      +12     
  Misses         35       35

Impacted Files	Coverage Δ
include/clara.hpp	93.46% <100%> (+0.15%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e306107...e609ec5. Read the comment docs.