Use AndreMiras' version of Coveralls action

According to coverallsapp/github-action#4 (comment),
this version works, unlike the official https://github.com/marketplace/actions/coveralls-github-action.

.github/workflows/test.yml

@@ -33,7 +33,17 @@ jobs:
  run: |
  flake8 --select F401, F405,E231 quantecon
  nosetests --with-coverage -a "!slow" --cover-package=quantecon
- - name: Coveralls
- uses: coverallsapp/github-action@master
+ - name: Coveralls Parallel
+ uses: AndreMiras/coveralls-python-action@develop
+ if: runner.os == 'Linux'
  with:
- github-token: ${{ secrets.github_token }}
+ flag-name: run-${{ matrix.test_number }}
+ parallel: true
+ coveralls_finish:
+ needs: tests
+ runs-on: ubuntu-latest
+ steps:
+ - name: Coveralls Finished
+ uses: AndreMiras/coveralls-python-action@develop
+ with:
+ parallel-finished: true