Merge pull request #359 from SalehBorhani/main

fix: change the condition in checkEven function

content/chapter 2/2.6-error-handling.md

@@ -231,7 +231,7 @@ func checkPositive(num int) error {
 }
 
 func checkEven(num int) error {
-	if num%2 == 1 {
+	if num%2 != 1 {
 		return notEven{num: num}
 	}
 	return nil