Reword help message to include help_all flag

[nurelin]

No description provided.

[codecov]

Codecov Report

Merging #197 into master will decrease coverage by 0.15%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master     #197      +/-   ##
==========================================
- Coverage     100%   99.84%   -0.16%     
==========================================
  Files          12       12              
  Lines        1884     1893       +9     
==========================================
+ Hits         1884     1890       +6     
- Misses          0        3       +3

Impacted Files	Coverage Δ
include/CLI/App.hpp	99.65% <72.72%> (-0.35%)	⬇️

---

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[codecov]

Codecov Report

Merging #197 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #197   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          12     12           
  Lines        1884   1893    +9     
=====================================
+ Hits         1884   1893    +9

Impacted Files	Coverage Δ
include/CLI/App.hpp	100% <100%> (ø)	⬆️

---

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 c65d9fd...6fac7f1. Read the comment docs.

[henryiii]

Thanks!