Use Coveralls action and remove redundant coverage install from jython setup file

.github/workflows/python-package.yml

@@ -44,5 +44,7 @@ jobs:
     - name: Test with tox for non Jython only
       if: ${{ ! matrix.jython }}
       run: tox
-    - name: Run coveralls
-      run: coveralls
+    - name: Coveralls
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}

ci/before_install_jython.sh

@@ -6,5 +6,5 @@ if [ ! -d "$INST_DIR" ]; then
     JYTHON_JAR=$(${PWD}/ci/mvnget.sh "$JYTHON")
     java -jar ${JYTHON_JAR} -s -d "$INST_DIR"
 fi
-pip install --upgrade virtualenv==15.1.0 tox==3.9.0 coverage==4.5.4
+pip install --upgrade virtualenv==15.1.0 tox==3.9.0
 sudo ln -s "$INST_DIR"/bin/jython /usr/local/bin/