42 mactime2 writes invalid csv in some cases

[janstarke]

fix #24 by using the csv crate instead of manually creating csv files

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 34.29%. Comparing base (8ffc2bd) to head (9e70656).

:exclamation: Current head 9e70656 differs from pull request most recent head 7829d97

Please upload reports for the commit 7829d97 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #43      +/-   ##
===========================================
+ Coverage    33.85%   34.29%   +0.43%     
===========================================
  Files           36       36              
  Lines         1143     1143              
===========================================
+ Hits           387      392       +5     
+ Misses         756      751       -5     

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[Bitbee0]