Enable pytest-cov[toml] akin to upstream coverage[toml]

nedbat/coveragepy#664 (+ later fixes)

Signed-off-by: Stavros Ntentos <[email protected]>

Author: stdedos

setup.py

@@ -142,7 +142,9 @@ def run(self):
             'six',
             'pytest-xdist',
             'virtualenv',
-        ]
+        ],
+        # Enable pyproject.toml support.
+        'toml': ['coverage[toml]'],
     },
     entry_points={
         'pytest11': [