Fix Makefile dist target.
This may not be the best solution if you'd prefer to have the README without extension in the dist tarball; then an additional target should likely be created to copy README.adoc to README (as done in !39 (merged)).
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This may not be the best solution if you'd prefer to have the README without extension in the dist tarball; then an additional target should likely be created to copy README.adoc to README (as done in !39 (merged)).