CI: Fix coveralls

Broken by coveralls>=2.1.0

.github/workflows/test.yml

@@ -21,7 +21,7 @@ jobs:
         if: github.event_name == 'push'
         env:
           COVERALLS_PARALLEL: true
-          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           python -m pip install coveralls
           python -m coveralls
@@ -34,19 +34,9 @@ jobs:
       - uses: actions/setup-python@v2
         with:
           python-version: 3.x
-      - name: Install Coveralls
-        run: python -m pip install coveralls
-      - name: Call Coveralls parallel builds webhook
-        shell: python
+      - name: Finish Coveralls parallel builds
         env:
-          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          import json, os, sys
-          from urllib.request import Request, urlopen
-          from coveralls import Coveralls
-          _, job, _ = Coveralls.load_config_from_github()
-          data = json.dumps({'repo_token': os.environ.get('COVERALLS_REPO_TOKEN', ''),
-                             'payload': {'status': 'done', 'build_num': job}}).encode()
-          headers = {'Content-type': 'application/json'}
-          with urlopen(Request('https://coveralls.io/webhook', data, headers)) as f:
-              sys.stderr.buffer.write(f.read() + b'\n')
+          python -m pip install coveralls
+          python -m coveralls --finish