chore(changelog): update changes

CHANGELOG_temp.md

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+Temporary changelog for the long-lived branch for decK-apiops. To minimize conflicts
+when rebaseing on the `main` branch. To be integrated into `CHANGELOG.md` when the
+branch is ready for merging.
+
+Note: the V2 below, will NOT be the final version it lands in!
+
+# Table of Contents
+
+- [v2.0.0](#v200)
+
+## [v2.0.0]
+
+> Release date: to-be-set
+
+### Added
+
+- Added a new command `openapi2kong` that will generate a deck file from an OpenAPI
+  3.0 spec. This is the replacement for the similar `inso` functionality.
+  The functionality is imported from the [go-apiops library](https://github.com/Kong/go-apiops).
+  [#939](https://github.com/Kong/deck/pull/939)
+- Added a new command `merge` that will merge multiple deck files. The files will not be
+  validated, which allows for working with incomplete or even invalid files in a pipeline.
+  The functionality is imported from the [go-apiops library](https://github.com/Kong/go-apiops).
+  [#939](https://github.com/Kong/deck/pull/939)
+- Added a new command `patch` for applying patches on top of a decK file. The patches can be
+  provided on the commandline, or via patch files. The deck file will not be
+  validated, which allows for working with incomplete or even invalid files in a pipeline.
+  The functionality is imported from the [go-apiops library](https://github.com/Kong/go-apiops).
+  [#939](https://github.com/Kong/deck/pull/939)
+
+### Fixes
+
+
+### Misc
+
+
+[v2.0.0]: https://github.com/kong/deck/compare/main...v2