Added public function to start a single migration step.

[triadev]

No description provided.

[codecov-io]

Codecov Report

Merging #15 into master will decrease coverage by 0.27%.
The diff coverage is 90.47%.

@@             Coverage Diff              @@
##             master      #15      +/-   ##
============================================
- Coverage     92.53%   92.25%   -0.28%     
- Complexity      163      169       +6     
============================================
  Files            27       27              
  Lines           442      452      +10     
============================================
+ Hits            409      417       +8     
- Misses           33       35       +2

Impacted Files	Coverage Δ	Complexity Δ
src/ElasticsearchMigration.php	91% <80%> (-0.67%)	33 <2> (+2)
src/Business/Service/MigrationSteps.php	96.29% <93.75%> (-3.71%)	10 <4> (+4)

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