Update README.md

Author: lucthienphong1120

README.md

@@ -9,11 +9,11 @@ what any sensible person would do, create a stack language hybrid.
 
 ### Character
 
-It is a single character. (`a`-`z`)
+It is a single character. (`a-z,@,#,$,%,^,&,*,...`)
 
 ### Numbers
 
-`1`, `2`, `3`, `4`, `5`, `6`, `7`, `8`, `9`, `0`
+`1, 2, 3, 4, 5, 6, 7, 8, 9, 0`
 
 ### Booleans