tweak release instructions

Author: SethTisue

RELEASING.md

@@ -1,7 +1,7 @@
 ## Creating a regular release
 
 1. Create a [new release](https://github.com/lightbend/genjavadoc/releases/new) with:
-  * `git tag -a -m 'Release v0.16' v0.16`
+  * `git tag -a -m 'Release v0.18' v0.18`
   * title and release description including notable changes
 2. This triggers a Github Action build that should test, build and publish to sonatype, and then close and release the repository to Maven Central.
 
@@ -10,7 +10,7 @@
 It is often the case when this compiler plugin needs to be released for a newly released Scala version. For this the process is the following:
 
 1. Checkout the version that is to be back-released, which would be
-  * `main`, if no features or bug fixes were merged to the main branch since the latest release. In this case create a tag recording you released from this commit, e.g. `git tag -a -m 'Release 0.16 for Scala 2.12.17' v0.16_2.12.17; git push --tags`.
+  * `main`, if no features or bug fixes were merged to the main branch since the latest release. In this case create a tag recording you released from this commit, e.g. `git tag -a -m 'Release 0.18 for Scala 2.12.17' v0.18_2.12.17; git push --tags`.
   * tag, if the main branch has unreleased features or bug fixes. In this case you will need to cherry pick the commit that adds support for the new Scala version.
-1. Create a file `version.sbt` containing `version in ThisBuild := "0.16"` which sets the version to be back-released. This will override the automatic version derivation from the git history. Alternatively you can `set version in ThisBuild := ...` in the command line.
+1. Create a file `version.sbt` containing `ThisBuild / version := "0.18"` which sets the version to be back-released. This will override the automatic version derivation from the git history. Alternatively you can `set ThisBuild / version := ...` in the command line.
 1. Publish the release by running `SONATYPE_USERNAME=xxx SONATYPE_PASSWORD=xxx sbt clean ++2.12.17 publishSigned sonatypeBundleRelease` (with the appropriate credentials and scala version). You will need Sonatype OSS repository rights to publish under `com.typesafe` organisation.