ci update

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install tox-travis flake8 tox pytest matplotlib==3.3.4 pytest-cov coveralls
+          pip install tox-travis flake8 tox pytest pytest-cov coveralls
           pip install dash-bootstrap-components dash[testing] webdriver_manager selenium
           pip install --upgrade setuptools importlib-metadata
           pip install -e .