update readme

Author: petabyt

README.md

@@ -5,10 +5,10 @@ Like wxWidgets, but in C. And much more bare-bones.
 This adds a bunch of experimental features and fixes:
 - [x] uiWindowSetIcon
 - [x] Windows HiDPI scaling
-- [x] `uiTabOnSelected`/`uiTabSetSelected` ([289](https://github.com/libui-ng/libui-ng/pull/289))
+- [x] ~~`uiTabOnSelected`/`uiTabSetSelected` ([289](https://github.com/libui-ng/libui-ng/pull/289))~~ merged upstream
 - [x] Tooltips ([266](https://github.com/libui-ng/libui-ng/pull/266)/[256](https://github.com/libui-ng/libui-ng/pull/256))
 - [x] Placeholders ([224](https://github.com/libui-ng/libui-ng/pull/224))
-- [x] Fix `uiWindowSetContentSize` ([261](https://github.com/libui-ng/libui-ng/pull/261))
+- [x] ~~Fix `uiWindowSetContentSize` ([261](https://github.com/libui-ng/libui-ng/pull/261))~~ merged upstream
 - [x] Fix darwin menu + modal window issues ([295](https://github.com/libui-ng/libui-ng/pull/295))
 - [x] Optional type safety with C11 generics (See `ui_safe.h`)
 - [x] Code editing control `uiScintilla` (https://github.com/petabyt/libui-scintilla)
@@ -19,12 +19,10 @@ This adds a bunch of experimental features and fixes:
 - [ ] [OnFilesDropped](https://github.com/matyalatte/libui-ng/commit/f3782dc426354eb09f04b8d2e1d28dbaef528ee0)
 - [ ] uiScroll (WIP)
 - [ ] uiImage control ([209](https://github.com/andlabs/libui/pull/209))
-- [ ] uiEntry and uiEditableCombobox placeholders ([224](https://github.com/libui-ng/libui-ng/pull/224))
 - [ ] uiEntryOnFinished ([290](https://github.com/andlabs/libui/pull/290))
 - [ ] uiImageButton
 - [ ] uiVersion API ([143](https://github.com/libui-ng/libui-ng/pull/143))
 - [ ] Expose more system functions to make adding controls easier
-- [ ] Arena allocator for uiControl handles
 
 # Compiling
 ```