update TODO.md

TODO.md

@@ -6,8 +6,13 @@
         - Different colors (kinda)
 2. Rerwite of function parsing code
     - Non `y=` functions.
-3. Display of intersections between functions
+3. Smart display of graph
+    - Display of intersections between functions
+    - Display of roots
+    - Local maximums and minimums (should be easy)
 4. Fix integral line
 5. re-add euler's number (well it works if you use capital e like `E^x`)
 6. allow constants in min/max integral input
-7. sliding values for functions (like a user-interactable slider that adjusts a variable in the function, like desmos)
+7. sliding values for functions (like a user-interactable slider that adjusts a variable in the function, like desmos)
+8. Keybinds
+9. nth derivative support (again)