Update readme.md

Author: ushelp

readme.md

@@ -165,7 +165,7 @@ var qrcode = new QRCode(options);
 		logo:"../demo/logo.png", // Relative address, relative to `easy.qrcode.min.js`
 		logo:"http://127.0.0.1:8020/easy-qrcodejs/demo/logo.png", 
 		logoWidth:80, // width. default is automatic width
-		logoHeight:80 // height. default is automatic height
+		logoHeight:80, // height. default is automatic height
 		logoBackgroundColor:'#fffff', // Logo backgroud color, Invalid when `logBgTransparent` is true; default is '#ffffff'
 		logoBackgroundTransparent:false, // Whether use transparent image, default is false
 		*/