Use newer coverage.

.github/workflows/ci.yml

@@ -258,7 +258,7 @@ jobs:
         env:
           PURE_PYTHON: 1
         run: |
-          python -mgevent.tests --coverage
+          python -mgevent.tests --coverage || python -m gevent.tests
       - name: "Tests: libuv"
         env:
           GEVENT_LOOP: libuv

setup.py

@@ -412,8 +412,8 @@ def run_setup(ext_modules):
 
                 # We don't run coverage on Windows, and pypy can't build it there
                 # anyway (coveralls -> cryptopgraphy -> openssl).
-                # As of coverage 5.0a6, coveralls (up to 1.9) won't work at all.
-                'coverage<5.0 ; sys_platform != "win32"',
+                # coverage 5 needs coveralls 1.11
+                'coverage >= 5.0 ; sys_platform != "win32"',
                 'coveralls>=1.7.0 ; sys_platform != "win32"',
 
                 'futures ; python_version == "2.7"',