Use python-dateutil package instead of dateutils (#324)

Author: meatcar

docs/tutorial.ipynb

@@ -39,10 +39,8 @@
       "Requirement already satisfied: sqlite-fts4 in /usr/local/lib/python3.9/site-packages (from sqlite_utils) (1.0.1)\n",
       "Requirement already satisfied: click in /Users/simon/Library/Python/3.9/lib/python/site-packages (from sqlite_utils) (7.1.2)\n",
       "Requirement already satisfied: tabulate in /usr/local/lib/python3.9/site-packages (from sqlite_utils) (0.8.7)\n",
-      "Requirement already satisfied: dateutils in /usr/local/Cellar/jupyterlab/3.0.16_1/libexec/lib/python3.9/site-packages (from sqlite_utils) (0.6.12)\n",
-      "Requirement already satisfied: python-dateutil in /usr/local/Cellar/jupyterlab/3.0.16_1/libexec/lib/python3.9/site-packages (from dateutils->sqlite_utils) (2.8.1)\n",
-      "Requirement already satisfied: pytz in /usr/local/Cellar/jupyterlab/3.0.16_1/libexec/lib/python3.9/site-packages (from dateutils->sqlite_utils) (2021.1)\n",
-      "Requirement already satisfied: six>=1.5 in /usr/local/Cellar/jupyterlab/3.0.16_1/libexec/lib/python3.9/site-packages (from python-dateutil->dateutils->sqlite_utils) (1.16.0)\n",
+      "Requirement already satisfied: python-dateutil in /usr/local/Cellar/jupyterlab/3.0.16_1/libexec/lib/python3.9/site-package (from sqlite-utils) (2.8.1)\n",
+      "Requirement already satisfied: six>=1.5 in /usr/local/Cellar/jupyterlab/3.0.16_1/libexec/lib/python3.9/site-package (from python-dateutil->sqlite-utils) (1.16.0)\n",
       "\u001b[33mWARNING: You are using pip version 21.1.1; however, version 21.2.2 is available.\n",
       "You should consider upgrading via the '/usr/local/Cellar/jupyterlab/3.0.16_1/libexec/bin/python3.9 -m pip install --upgrade pip' command.\u001b[0m\n",
       "Note: you may need to restart the kernel to use updated packages.\n"

setup.py

@@ -28,7 +28,7 @@ def get_long_description():
         "click",
         "click-default-group",
         "tabulate",
-        "dateutils",
+        "python-dateutil",
     ],
     setup_requires=["pytest-runner"],
     extras_require={