doc: updated FEATURES.md

FEATURES.md

@@ -74,8 +74,8 @@
 - [x] `yy` - Yank line (double press)
 
 ### Not Implemented
-- [ ] `c` - Change operator
-- [ ] `cc` - Change line
+- [x] `c` - Change operator
+- [x] `cc` - Change line
 - [ ] `>` - Indent right
 - [ ] `<` - Indent left
 - [ ] `=` - Auto-indent
@@ -96,9 +96,9 @@
 - [x] `A` - Insert at end of line
 - [x] `o` - Open line below
 - [x] `O` - Open line above
-- [ ] `s` - Substitute character (delete + insert)
-- [ ] `S` - Substitute line (delete line + insert)
-- [ ] `C` - Change to end of line
+- [x] `s` - Substitute character (delete + insert)
+- [x] `S` - Substitute line (delete line + insert)
+- [x] `C` - Change to end of line
 - [ ] `gi` - Insert at last insert position
 
 ### Delete Actions
@@ -415,6 +415,8 @@ Buffers are in-memory representations of files. A buffer exists for each open fi
 - [x] Delete operator (d, dd)
 - [x] Yank operator (y, yy)
 - [x] Paste actions (p, P)
+- [x] Change operator (c, cc, C)
+- [x] Substitute action (s, S)
 - [x] Insert mode entry (i, a, I, A, o, O)
 - [x] Insert mode editing (enter, backspace, delete, tab, ctrl+w)
 - [x] Visual modes (v, V, ctrl+v)
@@ -422,3 +424,4 @@ Buffers are in-memory representations of files. A buffer exists for each open fi
 - [x] Delete actions (x, D)
 - [x] Command mode basics
 - [x] Register behavior
+