update readme

readme.md

@@ -14,7 +14,7 @@ with this, you can make any level you want and convert it to be used with SMWDis
 ### what is currently not supported?
 1. changing the background tiles
 2. fully functional screen exits (currently being worked on, check out mwl2bin-experimental.py)
-3. level start flags
+3. main/midway/secondary entrances
 4. possibly other stuff i do not know about
 
 everything else like swapping gfx, music, palettes etc is supported.