VersionTask can manage 'v' prefix

[jawira]

I modified VersionTask to be able to manage 'v' prefix in version numbers. I also updated the doc and added tests for \VersionTask::getVersion.

I deleted \VersionTask::checkStartingVersion since the regex I added implicitly checks the validity of version too.

[codecov]

Codecov Report

Merging #955 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master    #955      +/-   ##
===========================================
+ Coverage      44.9%   44.9%   +<.01%     
+ Complexity     9920    9917       -3     
===========================================
  Files           499     499              
  Lines         24044   24034      -10     
===========================================
- Hits          10796   10792       -4     
+ Misses        13248   13242       -6

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/tasks/ext/VersionTask.php	78.31% <100%> (-1.26%)	27 <0> (-3)
classes/phing/util/SourceFileScanner.php	71.01% <0%> (+7.24%)	21% <0%> (ø)	⬇️

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[siad007]

Looks good to me ;)

[siad007]

Thanks @jawira