Update README.md

Author: ethan42

README.md

@@ -60,7 +60,7 @@
 | [Φυλλάδιο 2.pdf](https://github.com/progintro/lab-material/releases/download/0.1.19/lab02.pdf) | [lab02.md](https://github.com/progintro/lab-material/tree/main/labs/lab02) | [lab02.html](https://progintro.github.io/lab-material/labs/lab02) | [lab02](https://classroom.github.com/a/pqB_gumQ) |
 | [Φυλλάδιο 3.pdf](https://github.com/progintro/lab-material/releases/download/0.1.27/lab03.pdf) | [lab03.md](https://github.com/progintro/lab-material/tree/main/labs/lab03) | [lab03.html](https://progintro.github.io/lab-material/labs/lab03) | [lab03](https://classroom.github.com/a/WCiS9-wG) |
 | [Φυλλάδιο 4.pdf](https://github.com/progintro/lab-material/releases/download/0.1.27/lab04.pdf) | [lab04.md](https://github.com/progintro/lab-material/tree/main/labs/lab04) | [lab04.html](https://progintro.github.io/lab-material/labs/lab04) | [lab04](https://classroom.github.com/a/5V-31VHn) |
-| [Φυλλάδιο 5.pdf](https://github.com/progintro/lab-material/releases/download/0.1.30/lab05.pdf) | [lab04.md](https://github.com/progintro/lab-material/tree/main/labs/lab05) | [lab04.html](https://progintro.github.io/lab-material/labs/lab05) | [lab05](https://classroom.github.com/a/Gzr8ZRF7) |
+| [Φυλλάδιο 5.pdf](https://github.com/progintro/lab-material/releases/download/0.1.30/lab05.pdf) | [lab05.md](https://github.com/progintro/lab-material/tree/main/labs/lab05) | [lab05.html](https://progintro.github.io/lab-material/labs/lab05) | [lab05](https://classroom.github.com/a/Gzr8ZRF7) |
 
 Θες να βοηθήσεις να βελτιώσουμε τα Φυλλάδια; Στείλε μας PR στο [lab-material repo](https://github.com/progintro/lab-material).