Merge branch 'master' into fix/MC19

* master:
  Update readme and changelog for RC6 #222
  Replaced productReader by bulk product reader #217

Conflicts:
	CHANGELOG.md
fix on indentation
Merge branch 'fix/MC19' into fix/MC-21

* fix/MC19:
  fix on indentation

Conflicts:
	Normalizer/ProductValueNormalizer.php