Moved functional programming to advanced tutorial part (#218)

index.ipynb

@@ -11,14 +11,14 @@
     "- [Control Flow](./control_flow.ipynb)\n",
     "- [Functions](./functions.ipynb)\n",
     "- [Input-Output](./input_output.ipynb)\n",
-    "- [Functional programming](./functional_programming.ipynb)\n",
     "- [Object-oriented programming](./object_oriented_programming.ipynb)\n",
     "- [Modules and packages](./modules_and_packages.ipynb)\n",
     "\n",
     "# Advanced tutorial\n",
     "\n",
     "- [Manage Python project](./manage_python_project.ipynb)\n",
     "- [Advanced functions](./functions_advanced.ipynb)\n",
+    "- [Functional programming](./functional_programming.ipynb)\n",
     "- [Advanced Object-oriented programming](./object_oriented_programming_advanced.ipynb)\n",
     "- [Parallelism and concurrency in Python](./threads.ipynb)\n",
     "\n",