Added get version method

[borg1980]

To compare step by step changes - return based on version_id.

[codecov-io]

Codecov Report

Merging #39 into master will decrease coverage by 2.52%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master      #39      +/-   ##
============================================
- Coverage     99.13%   96.61%   -2.53%     
- Complexity       45       46       +1     
============================================
  Files             3        3              
  Lines           115      118       +3     
============================================
  Hits            114      114              
- Misses            1        4       +3

Impacted Files	Coverage Δ	Complexity Δ
src/Mpociot/Versionable/VersionableTrait.php	96.05% <0%> (-3.95%)	32 <1> (+1)

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