Update README to reflect flag name change

README.md

@@ -40,7 +40,7 @@ _If you are interested in contributing to kaniko, see [DEVELOPMENT.md](DEVELOPME
     - [--cache-dir](#--cache-dir)
     - [--cache-repo](#--cache-repo)
     - [--cleanup](#--cleanup)
-    - [--digestfile](#--digestfile)
+    - [--digest-file](#--digest-file)
     - [--insecure](#--insecure)
     - [--insecure-pull](#--insecure-pull)
     - [--no-push](#--no-push)
@@ -358,13 +358,13 @@ If `--destination=gcr.io/kaniko-project/test`, then cached layers will be stored
 _This flag must be used in conjunction with the `--cache=true` flag._
 
 
-#### --digestfile
+#### --digest-file
 
 Set this flag to specify a file in the container. This file will
 receive the digest of a built image. This can be used to
 automatically track the exact image built by Kaniko.
 
-For example, setting the flag to `--digestfile=/dev/termination-log`
+For example, setting the flag to `--digest-file=/dev/termination-log`
 will write the digest to that file, which is picked up by
 Kubernetes automatically as the `{{.state.terminated.message}}`
 of the container.