function readme(language) {
		let extension = (language === "" ? "" : ".") + language;
		let promise = new Promise((resolve, reject) => {
			fs.readFile('./README' + extension + '.md', "utf-8", (err, content) => {
				if (err) return reject(err);
				resolve(content);
			});
		});
		return promise.then((fileContent) => {
			let ret = buildReadme(jsonData, language, 0);
			fileContent = fileContent.replace(/<\!--BUILD_START-->[\d\D]+?<\!--BUILD_END-->/, "{%BuildStart%}");
			fs.writeFileSync('./README' + extension + '.md', fileContent.replace("{%BuildStart%}", "<!--BUILD_START-->\n\n" + ret + "\n\n<!--BUILD_END-->", "utf-8"));
			console.log('Readme (' + language + ') built successfully!');
		});
	}
To rebuild the README.md
@return Promise<any>