Update TODO list.

TODO

@@ -7,10 +7,6 @@ Below list contains things that should be changed/fixed/implemented.
 
 2. Some builtin functions like isset() seems to be useless, if variable is not defined, interpreter will throw an error.
 
-3. Interpreter does not check, if all methods from interface being implemented are defined in class.
+3. Accessing private attribute from parent class fails with 'Undefined class attribute' instead of error about visibility.
 
-4. object $x = new OOP(); fails with 'Return with a value in closure/method returning void'
+4. Interpreter does not check if all methods match their signatures from interfaces and virtual classes.
-
-5. Accessing private attribute from parent class fails with 'Undefined class attribute' instead of error about visibility.
-
-6. Interpreter does not check if all methods match their signatures from interfaces and virtual classes.