Replace bazel-genfiles with bazel-bin in documentation

Bug: Issue 11757
Change-Id: I63c3393d7d51062d73c27c8d46e937a74d19a5ca
diff --git a/README.md b/README.md
index c867ff5..85661e4 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@
     cd ./slack-integration
     bazel build slack-integration
 
-Once packaged, you can install the _./bazel-genfiles/slack-integration.jar_ file into
+Once packaged, you can install the _./bazel-bin/slack-integration.jar_ file into
 Gerrit.