Minor fix to release process

Signed-off-by: Yuri Shkuro <github@ysh.us>

RELEASE.md

@@ -5,7 +5,7 @@
      - Review all changes since the last release to determine how, if at all, any externally facing APIs are impacted. This includes, but is not limited to, the UI config and URL routes such as deep-linking and configuring the embedded mode.
    - Preface the version with a "v", e.g. `v1.0.0`.
 1. Create and merge, per approval, a PR which preps the release.
-   1. The PR title should match the format "Preparing release vX.Y.Z".
+   1. The PR title should match the format "Prepare release vX.Y.Z".
    1. CHANGELOG.md
       - Change the version of the current release from "Next (unreleased)" to "vX.Y.Z (Month D, YYYY)" where "vX.Y.Z" is the semver for this release.
       - Make sure all relevant changes made since the last release are present and listed under the current release. [`scripts/get-changelog.js`](https://github.com/jaegertracing/jaeger-ui/blob/52780c897f21131472de9b81c96ebd63853917ee/scripts/get-changelog.js) might be useful.