added extended chars to helpText

[dundee]

closes #68

[codecov]

Codecov Report

Merging #73 (9c1261a) into master (375c39d) will increase coverage by 0.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   95.14%   95.65%   +0.50%     
==========================================
  Files          17       17              
  Lines        1380     1380              
==========================================
+ Hits         1313     1320       +7     
+ Misses         39       34       -5     
+ Partials       28       26       -2     

Impacted Files	Coverage Δ
tui/tui.go	93.27% <ø> (ø)
report/export.go	92.00% <0.00%> (+7.00%)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 1051778465

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 97.151%

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Totals
Change from base Build 1051714130:	0.3%
Covered Lines:	1807
Relevant Lines:	1860

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💛 - Coveralls