fix CI

Author: Juke34

.github/workflows/main.yml

@@ -34,6 +34,6 @@ jobs:
         run: python -c "import sys; print(sys.version)"
         # Install the package using the setup.py
       - name: Install package
-        run: python setup.py install
+        run: pip install .
       - name: Run tests
         run: bash t/test.sh