update README

README.md

@@ -1,8 +1,9 @@
 # Chaka
 - Based on MuPDF Android Viewer
+- Add support of fill screen mode which enlarge the page to best position
 - Add support of vertical page flipping
-- Add support of text direction of right to left.
-- Add support of single column mode. It will split a double-page spread image of a scanned pdf book into two seperated pages, except the first and the last page.
-- Add current selection indication in fontsize interface.
-- Rewrite Table of Contents, support collapsing and expanding of headings.
+- Add support of right to left text direction.
+- Add support of single column mode. It splits a double-page spread image of a scanned pdf book into two seperated pages.
+- Add current selection indication in layout menu with flowable documents.
+- Rewrite outline function to support collapsing and expanding of headings.
 - Improve navigation and visual experience.