update readme

README.md

@@ -10,9 +10,9 @@ Image framework for iOS to display/encode/decode animated WebP, APNG, GIF, and m
 
 Features
 ==============
-- Display/encode/decode animated image with these types:<br/> WebP, APNG, GIF.
-- Display/encode decode still image with these types:<br/> WebP, PNG, GIF, JPEG, JP2, TIFF, BMP, ICO, ICNS.
-- Baseline/progressive/interlaced image decode with these types:<br/>PNG, GIF, JPEG, BMP.
+- Display/encode/decode animated image with these types:<br/>&nbsp;&nbsp;&nbsp;&nbsp;WebP, APNG, GIF.
+- Display/encode decode still image with these types:<br/>&nbsp;&nbsp;&nbsp;&nbsp;WebP, PNG, GIF, JPEG, JP2, TIFF, BMP, ICO, ICNS.
+- Baseline/progressive/interlaced image decode with these types:<br/>&nbsp;&nbsp;&nbsp;&nbsp;PNG, GIF, JPEG, BMP.
 - Display frame based image animation and sprire sheet animation.
 - Extendable protocol for custom image animation.
 - Dynamic frame buffer for lower memory usage.