removed unused poetry dependency

.github/workflows/publish.yml

@@ -13,13 +13,12 @@ jobs:
         uses: actions/setup-python@v1
         with:
           python-version: 3.7
-      - uses: snok/install-poetry@v1
       - name: Install and build
         run: |
              python -m ensurepip --user
              python -m pip install --upgrade pip --user
              python -m pip install .[dev]
-      - name: Build with Poetry
+      - name: Build
         run: python setup.py sdist bdist_wheel
       - name: Publish distribution 📦 to Test PyPI
         uses: pypa/gh-action-pypi-publish@master