Add a progress bar

[villfa]

Closes #199

[codecov]

Codecov Report

Merging #236 into master will increase coverage by 3.06%.
The diff coverage is 52.00%.

@@             Coverage Diff              @@
##             master     #236      +/-   ##
============================================
+ Coverage     79.28%   82.35%   +3.06%     
- Complexity      115      122       +7     
============================================
  Files            19       21       +2     
  Lines           338      357      +19     
============================================
+ Hits            268      294      +26     
+ Misses           70       63       -7     

Impacted Files	Coverage Δ	Complexity Δ
src/Commands/ChurnCommand.php	0.00% <0.00%> (ø)	8.00 <2.00> (+2.00)
src/Process/Observer/OnSuccessNull.php	0.00% <0.00%> (ø)	1.00 <1.00> (?)
src/Process/ProcessFactory.php	100.00% <ø> (ø)	3.00 <0.00> (?)
src/Process/ProcessHandlerFactory.php	100.00% <ø> (ø)	2.00 <0.00> (?)
src/Renderers/Results/ConsoleResultsRenderer.php	0.00% <0.00%> (ø)	1.00 <0.00> (-1.00)
src/Process/ChurnProcess.php	95.23% <100.00%> (ø)	9.00 <1.00> (?)
src/Process/Handler/ParallelProcessHandler.php	100.00% <100.00%> (ø)	11.00 <7.00> (?)
src/Process/Handler/SequentialProcessHandler.php	100.00% <100.00%> (ø)	4.00 <0.00> (?)
src/Process/Observer/OnSuccessProgress.php	100.00% <100.00%> (ø)	2.00 <2.00> (?)
... and 2 more

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