Add auto-fixing for SemicolonSpacingSniff

This is easily fixable.

See 
[fail](https://github.com/dereuromark/cakephp-codesniffer/blob/master/Vendor/PHP/CodeSniffer/Standards/Squiz/Test/files/semicolon_spacing_fail.php) / 
[expected](https://github.com/dereuromark/cakephp-codesniffer/blob/master/Vendor/PHP/CodeSniffer/Standards/Squiz/Test/files/semicolon_spacing_expected.php) / [pass](https://github.com/dereuromark/cakephp-codesniffer/blob/master/Vendor/PHP/CodeSniffer/Standards/Squiz/Test/files/semicolon_spacing_pass.php)