ROADMAP: Remove distributable-format target

This spun off with [1].

[1]: https://github.com/opencontainers/image-spec

Signed-off-by: W. Trevor King <[email protected]>

Author: wking

ROADMAP.md

@@ -88,9 +88,3 @@ Ensure that we have lifecycle hooks in the correct places with full coverage ove
 Will probably go away with Vish's work on splitting create and start, and if we have exec.
 
 *Owner:*
-
-### Distributable Format
-
-A common format for serializing and distributing bundles.
-
-*Owner:* vbatts