Add script to replace Prettier stable/Prettier master with the actual versions (#8984)

* Add a script replaces 'Prettier stable' => 'Prettier x.x'

* Fix by prettier

* Implement replaceVersionInBlogPost in release steps

* Update scripts/release/steps/update-changelog.js

Co-authored-by: fisker Cheung <lionkay@gmail.com>

* Fix from review

* Format version

* Update scripts/release/steps/update-changelog.js

Co-authored-by: fisker Cheung <lionkay@gmail.com>

* `ver` -> `version`

* `Version` -> `Versions`

Co-authored-by: fisker Cheung <lionkay@gmail.com>

scripts/release/steps/update-changelog.js

@@ -30,6 +30,18 @@ function writeChangelog({ version, previousVersion, releaseNotes }) {
   fs.writeFileSync("CHANGELOG.md", newEntry + "\n\n" + changelog);
 }
 
+function formatVersion(version) {
+  return `${semver.major(version)}.${semver.minor(version)}`;
+}
+
+function replaceVersionsInBlogPost({ blogPost, version, previousVersion }) {
+  const blogPostData = fs.readFileSync(blogPost, "utf-8");
+  const newBlogPostData = blogPostData
+    .replace(/prettier stable/gi, `Prettier ${formatVersion(previousVersion)}`)
+    .replace(/prettier master/gi, `Prettier ${formatVersion(version)}`);
+  fs.writeFileSync(blogPost, newBlogPostData);
+}
+
 module.exports = async function ({ version, previousVersion }) {
   const semverDiff = semver.diff(version, previousVersion);
 
@@ -41,6 +53,11 @@ module.exports = async function ({ version, previousVersion }) {
       releaseNotes: `🔗 [Release Notes](https://prettier.io/${blogPost.path})`,
     });
     if (fs.existsSync(blogPost.file)) {
+      replaceVersionsInBlogPost({
+        blogPost: blogPost.file,
+        version,
+        previousVersion,
+      });
       // Everything is fine, this step is finished
       return;
     }