Update tests to follow new syntax.

tests/factorial_test.aer

@@ -1,13 +1,13 @@
 class Program {
 
-	function factorial(int $num) {
+	int factorial(int $num) {
 		if($num == 0 || $num == 1)
 			return 1;
 		else
 			return $num * $this->factorial($num - 1);
 	}
 
-	function main() {
+	void main() {
 		int $num = 7;
 		print('Factorial of ', $num, ' is ', $this->factorial($num), '.');
 	}