Update version and CHANGELOG for release (#4298)

Co-authored-by: Olivaw[bot] <[email protected]>

Author: github-actions[bot]

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.0.21] - 2023-07-18
+
+### 🚀 New Features and Enhancements
+
+- Update copy in add stage component [#4292](https://github.com/iterative/vscode-dvc/pull/4292) by [@mattseddon](https://github.com/mattseddon)
+- Add "Save as TSV" option to plot modal [#4285](https://github.com/iterative/vscode-dvc/pull/4285) by [@julieg18](https://github.com/julieg18)
+
+### 🔨 Maintenance
+
+- Remove `dvc_data_version_info` from plot values [#4262](https://github.com/iterative/vscode-dvc/pull/4262) by [@julieg18](https://github.com/julieg18)
+
 ## [1.0.20] - 2023-07-17
 
 ### 🐛 Bug Fixes

extension/package.json

@@ -9,7 +9,7 @@
   "extensionDependencies": [
     "vscode.git"
   ],
-  "version": "1.0.20",
+  "version": "1.0.21",
   "license": "Apache-2.0",
   "readme": "./README.md",
   "repository": {