pylint fix

fixed pylint to install python_dotenv instead of dotenv

.github/workflows/pylint.yml

@@ -19,6 +19,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install pylint
         pip install revolt.py
+        pip install python-dotenv
     - name: Analysing the code with pylint
       run: |
         pylint $(git ls-files '*.py')