Fix bad encoding when creating default PrintWriter

[charphi]

Fix #1320

[codecov]

Codecov Report

Merging #1321 (9da5d21) into master (ac0dcea) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1321   +/-   ##
=========================================
  Coverage     93.77%   93.77%           
- Complexity      469      474    +5     
=========================================
  Files             2        2           
  Lines          6952     6957    +5     
  Branches       1865     1867    +2     
=========================================
+ Hits           6519     6524    +5     
  Misses          146      146           
  Partials        287      287           

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/picocli/CommandLine.java	93.60% <100.00%> (+<0.01%)	330.00 <12.00> (+5.00)

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[remkop]

Thanks for the PR!
Merged and documented in the release notes.