Clean up double lines below the 'casts' stub

[benjam-es]

Synopsis:

When editing stubs, my autosave code cleanup spotted (and removed) double lines below the 'casts' declaration. This is caused by preceding each relationship method with PHP_EOL. The first relationship adds PHP_EOL which follows the whitespace at the bottom of the 'casts' stub.

Proposed Syntax:

Simple check, to display PHP_EOL only from the second relationship onward.

Expected Behavior:

When saving and prettifying stubs, they would no longer break the tests.

[benjam-es]

Merged