Update lexer.py

lexer.py

@@ -4,6 +4,7 @@ from typing import List, Tuple
 Token = Tuple[str, str]
 
 RESERVED = {
+    "int", "float", "boolean",
     "ACTIVATE_SENSOR", "ACTIVATE_ALARM", "BREAK", "CALIBRATE", "CHARGE_BATTERY", "CHECK_BATTERY",
     "CLOSE_DOOR", "CONTINUE", "COPY_FILE", "DEACTIVATE_ALARM", "DEACTIVATE_SENSOR",
     "DECREASE_SPEED", "DELETE_FILE", "DOWNLOAD", "ELSE", "FALSE", "FOR", "IF", "INCREASE_SPEED",