Update .gitignore

.gitignore

 /target
-

corpus/buclesimple.c

-#include <stdio.h>
-
-int main(){
-	int a = 20;
-	for(int i=0; i<=0; i++){
-		a=a-1;
-		a*2;
-	
-	}
-	return 0;
-}