Use coveralls python package

.github/workflows/CI.yml

@@ -60,7 +60,7 @@ jobs:
             pip install -r requirements.txt
             python setup.py install
       - name: "Install Coverage tool"
-        run: pip install coverage
+        run: pip install coverage coveralls
       - name: "Install JAX"
         if: matrix.os != 'windows-latest'
         run: pip install jax jaxlib # (optional import)
@@ -73,7 +73,7 @@ jobs:
         run: coverage run --append --source=pysr --omit=pysr/feynman_problems.py test/test_jax.py
         shell: bash
       - name: Coveralls
-        uses: coverallsapp/github-action@master
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          path-to-lcov: .coverage
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+            coveralls