1.6.0 PSR12 Remove control structure spacing sniff, bump requirements

The stable requirement has been replaced by ^3.0 to force the PSR12
standard. PHPCS ^3.5 has been required because it includes the used
ReturnTypeDeclaration sniff.

The control structure sniff conflicts with PSR12 so it has been removed.

Add extra phpcs checks

Add extra phpcs checks (#5)

Squiz.WhiteSpace.MemberVarSpacing for enforcing new lines between class
properties.

PSR12.Functions.ReturnTypeDeclaration for how to write return types.

1.4.0: Merge pull request #4 from mediact/feature/exclude-m2-phpmd-checks

1.4.0 Feature: excluded some Magento 2 PHPMD checks

More strict rules

Merge pull request #3 from marcelmediact/feature/improve-quality-codi…

…ng-standard

Feature: improved coding standard

Remove marketplace standard until it is compatible with PHPCS3

Merge pull request #2 from mediact/feature/MAGE2-92

1.2.0 Remove marketplace standard until it is compatible with PHPCS3