Invalid sorting in Table of Contents

Table of Contents in `README.md` has invalid sorting, in `Behavioral` section (`Visitor` pattern should be after `Template Method` pattern) ### 📷 Screenshot <img width="604" alt="Screenshot 2023-06-29 at 21 56 45" src="https://github.com/ochococo/Design-Patterns-In-Swift/assets/2694531/d38b8e27-df4e-44de-973d-365ce664c24e">