create root report dir before creating any outputs

[SurpSG]

#16

[codecov-commenter]

Codecov Report

Merging #18 (00b2fed) into develop (1bcb38d) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             develop      #18      +/-   ##
=============================================
+ Coverage      91.11%   91.17%   +0.05%     
  Complexity       106      106              
=============================================
  Files             19       19              
  Lines            484      487       +3     
  Branches          52       52              
=============================================
+ Hits             441      444       +3     
  Misses            23       23              
  Partials          20       20              

Impacted Files	Coverage Δ
...kotlin/com/form/coverage/tasks/DiffCoverageTask.kt	81.25% <100.00%> (+1.25%)	⬆️
...n/kotlin/com/form/coverage/tasks/git/DiffSource.kt	100.00% <100.00%> (ø)

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