Add a section on different package managers (#238)

* Add a section on different package managers.

* Update TOC.

Author: yakutovicha

manage_python_project.ipynb

@@ -61,6 +61,7 @@
     "    - [Changelog](#Changelog)\n",
     "      - [CHANGELOG.md](#CHANGELOG.md)\n",
     "      - [GitHub releases](#GitHub-releases)\n",
+    "    - [Package managers](#Package-managers)\n",
     "  - [Automate things](#Automate-things)\n",
     "    - [Testing](#Testing)\n",
     "    - [Exercise on testing automation](#Exercise-on-testing-automation)\n",
@@ -1495,6 +1496,26 @@
    "cell_type": "markdown",
    "id": "61",
    "metadata": {},
+   "source": [
+    "## Package managers\n",
+    "\n",
+    "There are several package managers that can be used to release the package on PyPI.\n",
+    "In this tutorial, we have used [`flit`](https://flit.pypa.io/).\n",
+    "However, there are other package managers that can be used, such as [`setuptools`](https://setuptools.pypa.io/), [`poetry`](https://python-poetry.org/), [`hatch`](https://hatch.pypa.io/), etc.\n",
+    "\n",
+    "In this tutorial we will not go into the details of the package managers, as they are well documented.\n",
+    "We also don't want to start a flame war on which package manager is the best and why.\n",
+    "The choice is essentially up to the developers.\n",
+    "One can always switch between managers if the current one does not satisfy the needs.\n",
+    "\n",
+    "\n",
+    "If you want to deep dive into the topic, we recommend looking at the [Python Packaging User Guide](https://packaging.python.org/)."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "62",
+   "metadata": {},
    "source": [
     "# Automate things\n",
     "\n",
@@ -1508,7 +1529,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "62",
+   "id": "63",
    "metadata": {},
    "source": [
     "## Testing\n",
@@ -1560,7 +1581,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "63",
+   "id": "64",
    "metadata": {},
    "source": [
     "## Exercise on testing automation\n",
@@ -1571,7 +1592,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "64",
+   "id": "65",
    "metadata": {},
    "source": [
     "## Version update\n",
@@ -1625,7 +1646,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "65",
+   "id": "66",
    "metadata": {},
    "source": [
     "## Exercise on version update automation\n",
@@ -1637,7 +1658,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "66",
+   "id": "67",
    "metadata": {},
    "source": [
     "## Releasing\n",
@@ -1731,7 +1752,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "67",
+   "id": "68",
    "metadata": {},
    "source": [
     "## Exercises on releasing automation\n",