README.md in slugbuilder-1.1.0 vs README.md in slugbuilder-1.2.0

@@ -106,9 +106,10 @@
 - `postbuild` Proc (optional): an optional Proc (or anything that conforms to the `call` API of a Proc) that will run post-build. The Proc will receive a Hash with the structure:
   - `slug` String: Location of the built slug file
   - `repo` String: The git repo identifier
   - `git_ref` String: The git branchname or SHA
   - `git_sha` String: The git SHA (even if the git ref was a branch name)
+  - `request_id` String: The unique id of the build request
   - `stats` Hash:
     - setup `Float`: Amount of time spent in setup
     - build `Float`: Total amount of time spent in build (compile/build/slug)
     - compile `Float`: Amount of time spent in buildpack compilation
     - slug `Float`: Amount of time compressing the slug