Explain pylint runs in an isolated virtualenv

As described in pre-commit/pre-commit-hooks#157 using this hook runs pylint isolated from everything else.
aleb · Jan 8, 2020 · 6759ead · 6759ead
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diff --git a/README.md b/README.md
@@ -16,3 +16,9 @@ Add this to your `.pre-commit-config.yaml`:
         rev: ''  # Use the sha / tag you want to point at
         hooks:
         -   id: pylint
+
+
+Note: this way pylint runs in an isolated Python virtualenv.
+If you need pylint to do dynamic analysis of the code
+in the app's own Python virtualenv, use it as a
+[Repository local hook](https://pre-commit.com/#repository-local-hooks).