edited l05

Author: Saeid Darvish

source/index.rst

@@ -32,7 +32,7 @@
    lessons/l02-setup-python
    lessons/l03-create-and-run-a-python-project
    lessons/l04-python-interactive-mode
-   lessons/l05
+   lessons/l05-object-oriented-programming
    lessons/l06
    lessons/l07
    lessons/l08