add coveralls to GitHub actions

Author: mohamed82008

.github/workflows/CI.yml

@@ -24,4 +24,7 @@ jobs:
       - uses: julia-actions/setup-julia@latest
         with:
           version: ${{ matrix.julia-version }}
-      - uses: julia-actions/julia-runtest@master
+      - uses: julia-actions/julia-runtest@master
+      - uses: coverallsapp/github-action@master
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}