docs: put in instructions on how to update package version (#626)

Author: aslushnikov

ROLLING.md

@@ -5,3 +5,9 @@
 * set new driver version in `scripts/CLI_VERSION`
 * regenerate API: `./scripts/download_driver_for_all_platforms.sh -f && ./scripts/generate_api.sh && ./scripts/update_readme.sh`
 * commit & send PR with the roll
+
+# Updating Version
+
+```bash
+./scripts/set_maven_version.sh 1.15.0
+```