Merge pull request #1649 from iluxonchik/chore/update-pytest-test-iso…

…lation

Correct URL to PyTest Isolation Guide

brownie/test/managers/master.py

@@ -64,7 +64,7 @@ def pytest_sessionfinish(self, session):
             raise pytest.UsageError(
                 "xdist workers failed to collect tests. Ensure all test cases are "
                 "isolated with the module_isolation or fn_isolation fixtures.\n\n"
-                "https://eth-brownie.readthedocs.io/en/stable/tests.html#isolating-tests"
+                "https://eth-brownie.readthedocs.io/en/stable/tests-pytest-intro.html#pytest-fixtures-isolation"
             )
         build_path = self.project._build_path