Documentation fix where utilities are available

All utilities are now under the .cipd/ directory

Change-Id: Ic0d5ff10a8eaff21d1e29b14197e6c95f18431c7
diff --git a/README.md b/README.md
index 4cb85c5..21c9c96 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@
 The environment setup script will pull down the versions of tools necessary
 to build Pigweed and add them to your environment. You can then build with
 GN, CMake, or Bazel. You can also confirm you're getting the right versions
-of tools—they should be installed under `env_setup/`.
+of tools—they should be installed under `.cipd/`.
 
 **Build for the host with GN**
 ```bash