Minor changes to the Base64LineBreaker

[wneessen]

• Renamed the file to a more fitting name
• Added tests for the Write() and Close() methods

[codecov-commenter]

Codecov Report

Merging #40 (e33df7f) into main (c6fe75f) will increase coverage by 0.35%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   82.43%   82.78%   +0.35%     
==========================================
  Files          11       11              
  Lines        1127     1127              
==========================================
+ Hits          929      933       +4     
+ Misses        139      136       -3     
+ Partials       59       58       -1     

Impacted Files	Coverage Δ
b64linebreaker.go	60.00% <ø> (ø)
msg.go	84.41% <0.00%> (+0.19%)	:arrow_up:
msgwriter.go	91.86% <0.00%> (+1.43%)	:arrow_up:

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