Adds note for #47.

ashfurrow · Jul 12, 2017 · e76d24e · e76d24e
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diff --git a/README.md b/README.md
@@ -36,6 +36,7 @@ If you want the lint result shows in diff instead of comment, you can use `inlin
 swiftlint.lint_files inline_mode: true
 ```
 
+You can use the `SWIFTLINT_VERSION` environment variable to override the default version installed via the `rake install` task.
 
 ## Attribution