Update composer.json

Skipped branch master, "https://api.github.com/repos/davidmpaz/WideImageBundle/contents/composer.json?ref=7e7bdb04f2feb87f64f64c67865fc8b361fc05bf" does not contain valid JSON
Parse error on line 11:
...per Kozak",        },        {       
----------------------^
Expected: 'STRING' - It appears you have an extra trailing comma