add product variant by sku accessor

[jenschude]

[codecov[bot]]

Codecov Report

Merging #64 (82e29e8) into master (f0d2415) will increase coverage by 0.02%. The diff coverage is 94.73%.

:exclamation: Current head 82e29e8 differs from pull request most recent head c7acbac. Consider uploading reports for the commit c7acbac to get more accurate results

@@             Coverage Diff              @@
##             master      #64      +/-   ##
============================================
+ Coverage     11.69%   11.71%   +0.02%     
- Complexity    69463    69472       +9     
============================================
  Files          6296     6297       +1     
  Lines        172449   172468      +19     
============================================
+ Hits          20160    20208      +48     
+ Misses       152289   152260      -29     

Impacted Files	Coverage Δ
...c/Api/Models/Product/ProductVariantSkuAccessor.php	94.73% <94.73%> (ø)
...-api/src/Models/Product/ProductProjectionModel.php	14.95% <0.00%> (+2.56%)	:arrow_up:
lib/commercetools-base/src/Base/MapperSequence.php	51.47% <0.00%> (+5.88%)	:arrow_up:
...ols-api/src/Models/Product/ProductVariantModel.php	25.61% <0.00%> (+9.91%)	:arrow_up:
...pi/src/Models/Product/ProductVariantCollection.php	61.53% <0.00%> (+61.53%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update f0d2415...c7acbac. Read the comment docs.