docs: Adds entries to CHANGELOG for #40

- Details new laminas:automatic-releases:bump-changelog command
- Details changes to "switch default branch to next minor" command

Signed-off-by: Matthew Weier O'Phinney <[email protected]>

Author: weierophinney

CHANGELOG.md

@@ -2,6 +2,28 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
+## 1.2.0 - TBD
+
+### Added
+
+- [#40](https://github.com/laminas/automatic-releases/pull/40) adds a new command, laminas:automatic-releases:bump-changelog. When a `CHANGELOG.md` file is present in the repository, it will add an entry in the file for the next patch-level release to the target branch of the closed milestone. The patch also adds the command to the end of the suggested workflow configuration.
+
+### Changed
+
+- [#40](https://github.com/laminas/automatic-releases/pull/40) updates the laminas:automatic-releases:switch-default-branch-to-next-minor command such that if a `CHANGELOG.md` file is present in the repository, and a new minor release branch is created, it adds an entry to the file for the next minor release.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- Nothing.
+
 ## 1.1.0 - 2020-08-06
 
 ### Added