Revert "Do not publish maven-metadata.xml.sha256/512 files to sonatyp…

…e." as this is now supported by sonatype.

RELEASING.md

@@ -4,7 +4,7 @@
 2. Update the `CHANGELOG.md` for the impending release.
 3. Update the `README.md` with the new version.
 4. `git commit -am "Prepare for release X.Y.Z."` (where X.Y.Z is the new version).
-5. `./gradlew clean uploadArchives --no-daemon --no-parallel -Dorg.gradle.internal.publish.checksums.insecure=true`
+5. `./gradlew clean uploadArchives --no-daemon --no-parallel`
 6. Visit [Sonatype Nexus](https://oss.sonatype.org/) and promote the artifact.
 7. `git tag -a X.Y.X -m "X.Y.Z"` (where X.Y.Z is the new version)
 8. Update the top-level `gradle.properties` to the next SNAPSHOT version.