Update path to test262-runner in README

Build/libjs-test262-runner no longer exists.

Author: trflynn89

README.md

@@ -34,7 +34,7 @@ case, so you'll need to build `libLagom.a` yourself.
 Once that's done, run:
 
 ```console
-python3 main.py --libjs-test262-runner ./Build/libjs-test262-runner --test262-root ./test262/
+python3 main.py --libjs-test262-runner ./Build/_deps/lagom-build/test262-runner --test262-root ./test262/
 ```
 
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