message: updated release date for 1.23.2
diff: * Renaming symbol fails within a file that had recently been renamed without saving changes.
  * As a workaround, make an edit within the file before using Rename Symbol.
  -## 1.23.2 (Not yet released)
  +## 1.23.2 (September 3, 2020)
  * Ensure that all quickinfo sections have linebreaks between them, and don't add unecessary duplicate linebreaks (PR: [omnisharp-roslyn#1900](https://github.com/OmniSharp/omnisharp-roslyn/pull/1900))
  * Support completion of unimported types (PR: [omnisharp-roslyn#1896](https://github.com/OmniSharp/omnisharp-roslyn/pull/1896))
  * Exclude Misc project from InternalsVisibleTo completion (PR: [omnisharp-roslyn#1902](https://github.com/OmniSharp/omnisharp-roslyn/pull/1902))
  