Update CHANGELOG and version for 9.1.0

CHANGELOG.md

@@ -8,6 +8,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 <!-- markdownlint-disable MD024 -->
 <!-- markdownlint-disable MD004 -->
 
+## [9.1.0] (2022-03-19)
+
+### Added
+
+- Option `.conflicts()` to set conflicting options which can not be specified together ([#1678])
+- (developer) CodeQL configuration for GitHub Actions ([#1698])
+
+
 ## [9.0.0] (2022-01-28)
 
 ### Added
@@ -1029,6 +1037,8 @@ program
 [#1669]: https://github.com/tj/commander.js/pull/1669
 [#1671]: https://github.com/tj/commander.js/pull/1671
 [#1675]: https://github.com/tj/commander.js/pull/1675
+[#1678]: https://github.com/tj/commander.js/pull/1678
+[#1698]: https://github.com/tj/commander.js/pull/1698
 
 <!-- Referenced in 5.x -->
 [#1]: https://github.com/tj/commander.js/issues/1
@@ -1107,6 +1117,7 @@ program
 [#1028]: https://github.com/tj/commander.js/pull/1028
 
 [Unreleased]: https://github.com/tj/commander.js/compare/master...develop
+[9.1.0]: https://github.com/tj/commander.js/compare/v9.0.0...v9.1.0
 [9.0.0]: https://github.com/tj/commander.js/compare/v8.3.0...v9.0.0
 [9.0.0-1]: https://github.com/tj/commander.js/compare/v9.0.0-0...v9.0.0-1
 [9.0.0-0]: https://github.com/tj/commander.js/compare/v8.3.0...v9.0.0-0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "commander",
-  "version": "9.0.0",
+  "version": "9.1.0",
   "description": "the complete solution for node.js command-line programs",
   "keywords": [
     "commander",