Inlines the given files.

@param {Object} config - A configuration.
@param {String[]} files - The files.
@return {Promise} A promise that returns an info message.
function inline(config, files) {

	return new Promise((resolve, reject) => {

		let filesChanged = 0;
		let i = 0;

		(function proceed(result) {

			if(result) {

				filesChanged++;

			}

			if(i === files.length) {

				resolve("Modified " + filesChanged + " files");

			} else {

				InlineImport.transform(files[i++], config.options).then(proceed).catch(reject);

			}

		}());

	});

}