Add support for fossil

[villfa]

Closes #276

[codecov]

Codecov Report

Merging #285 (c556204) into master (c4260a2) will increase coverage by 0.15%.
The diff coverage is 95.12%.

@@             Coverage Diff              @@
##             master     #285      +/-   ##
============================================
+ Coverage     96.66%   96.81%   +0.15%     
  Complexity        1        1              
============================================
  Files            25       27       +2     
  Lines           480      503      +23     
============================================
+ Hits            464      487      +23     
  Misses           16       16              

Impacted Files	Coverage Δ	Complexity Δ
src/Process/ChangesCountProcessBuilder.php	92.30% <92.30%> (ø)	0.00 <0.00> (?)
...Process/ChangesCount/FossilChangesCountProcess.php	100.00% <100.00%> (ø)	0.00 <0.00> (?)
src/Process/ProcessFactory.php	95.23% <100.00%> (+3.13%)	0.00 <0.00> (ø)

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