Print help infinite loop fix

[patrickkuo]

Print help run into infinite loop when length of the text equals to columnValue.maxLength and offset is non zero.

[codecov-io]

Codecov Report

Merging #547 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #547   +/-   ##
=========================================
  Coverage     89.17%   89.17%           
  Complexity      285      285           
=========================================
  Files             4        4           
  Lines          3946     3946           
  Branches        967      967           
=========================================
  Hits           3519     3519           
  Misses          213      213           
  Partials        214      214

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/picocli/CommandLine.java	89.21% <100%> (ø)	160 <0> (ø)	⬇️

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[remkop]

Merged.
Good catch! Thank you very much!