Add note to release PR about this plugin (#36)

src/cmd/prepare.ts

@@ -110,7 +110,14 @@ export async function prepare({
 
   const releaseDescription = config.user.getReleaseDescription
     ? await config.user.getReleaseDescription(hookCtx)
-    : getChangeLogSection(nextVersion, config, changes, forge, false);
+    : `This PR was opened by the ` +
+      `[ready-release-go](https://github.com/woodpecker-ci/plugin-ready-release-go) plugin.` +
+      `When you're ready to do a release, you can merge this and a release and tag with ` +
+      `version \`${nextVersion}\` will be created automatically.` +
+      `If you're not ready to do a release yet, that's fine, ` +
+      `whenever you add more changes to \`${releaseBranch}\`` +
+      `this PR will be updated.` +
+      getChangeLogSection(nextVersion, config, changes, forge, false);
 
   console.log("# Creating release pull-request");
   const pullRequestLink = await forge.createOrUpdatePullRequest({

src/utils/types.ts

@@ -50,7 +50,7 @@ export type UserConfig = Partial<{
    * Get the release description.
    *
    * Used as pull-request and release description.
-   * By default it's `Release of ${version}`
+   * By default it's the changelog part of the current / next version.
    */
   getReleaseDescription: (ctx: HookContext) => PromiseOrValue<string>;