ROADMAP: remove the pre-v1.0.0 roadmap

This is not stopping a future roadmap, only removing the one for
pre-v1.0.0

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

README.md

@@ -10,7 +10,6 @@ Additional documentation about how this group operates:
 
 - [Code of Conduct][code-of-conduct]
 - [Style and Conventions](style.md)
-- [Roadmap](ROADMAP.md)
 - [Implementations](implementations.md)
 - [Releases](RELEASES.md)
 - [project](project.md)
@@ -35,11 +34,6 @@ Example use cases include sophisticated network configuration, volume garbage co
 
 Runtime developers can build runtime implementations that run OCI-compliant bundles and container configuration, containing low-level OS and host-specific details, on a particular platform.
 
-## Releases
-
-There is a loose [Road Map](./ROADMAP.md).
-During the `0.x` series of OCI releases we make no backwards compatibility guarantees and intend to break the schema during this series.
-
 ## Contributing
 
 Development happens on GitHub for the spec.