Add support for subversion

[villfa]

Closes #274

[codecov]

Codecov Report

Merging #299 (80d2d12) into master (d5a474b) will increase coverage by 0.07%.
The diff coverage is 96.55%.

@@             Coverage Diff              @@
##             master     #299      +/-   ##
============================================
+ Coverage     97.69%   97.77%   +0.07%     
  Complexity        1        1              
============================================
  Files            29       30       +1     
  Lines           521      539      +18     
============================================
+ Hits            509      527      +18     
  Misses           12       12              

Impacted Files	Coverage Δ	Complexity Δ
src/Process/ChangesCountProcessBuilder.php	94.87% <95.83%> (+2.56%)	0.00 <0.00> (ø)
...ess/ChangesCount/SubversionChangesCountProcess.php	100.00% <100.00%> (ø)	0.00 <0.00> (?)

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