chore: guide for producing release notes (#1165)

docs/releasing.md

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+# Preparing release notes
+
+1. Use ["draft new release tag"](https://github.com/microsoft/playwright/releases/new).
+1. Version starts with "v", e.g. "v1.1.0".
+1. Fill "Raw notes".
+    - `git fetch --tags upstream`
+    - `git log --pretty="%h - %s" v1.0.0..HEAD`
+1. Fill "Bug fixes".
+    - `git log v0.11.1..HEAD`
+    - Manually look for `#1234` references in commit messages.
+1. Fill "Current status".
+    - `node utils/print_versions.js`
+    - Copy tests status from [IsPlaywrightReady](https://aslushnikov.github.io/isplaywrightready/).
+1. Fill "Highlights" if any.
+    - Be creative.
+1. Fill "Breaking API Changes" if any.
+    - `git diff v0.11.1:docs/api.md docs/api.md`
+1. Fill "New APIs" if any.
+    - `git diff v0.11.1:docs/api.md docs/api.md`
+1. When making links to the API, copy actual links from [GitHub](https://github.com/microsoft/playwright/blob/master/docs/api.md), and not from `api.md` source - these might be incorrect.
+    - Before publishing, replace `blob/master/docs` with `blob/v1.1.0/docs` in all the links.
+1. Use "Save Draft", not "Publish".
+

utils/print_versions.js

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+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const pw = require('..');
+const child_process = require('child_process');
+
+for (const browserType of [pw.chromium, pw.firefox]) {
+  const executablePath = browserType.executablePath();
+  const version = child_process.execSync(executablePath + ' --version').toString().trim();
+  console.log(version);
+}
+console.log('WebKit 13.0.4');