#94 - return statement missing blank line fixer

[kamilpiech97]

This should close #94.

With these changes this:

    public function getFoo(int $foo): int {
        $bar = $foo;
        return $bar;
    }

will be fixed into:

    public function getFoo(int $foo): int {
        $bar = $foo;

        return $bar;
    }

[krzysztofrewak]

(approved by misclick)