remove an ignore test

src/simulator/mem_cmp.rs

@@ -209,7 +209,6 @@ mod tests {
     use super::*;
 
     #[test]
-    #[ignore]
     fn test_fill_memory(){
         let m_c = MemChecker::from("test/machine/memory.txt").unwrap();
         let mut machine = Machine::init_machine();