Doesn't work with grunt-cwebp

[GrzegorzZajac000]

Grunt-newer doesn't work with grunt-cwebp. This is my configuration:

         cwebp: {
            public: {
                options: {
                    q       : 80,
                    alpha_q : 80
                },
                files: [{
                    expand : true,
                    cwd    : 'public/images/', 
                    src    : ['**/*.{png,jpg,jpeg,gif}'],
                    dest   : 'public/images/webp'
                }]
            }
        },