docs: document F# 8 dot-lambda syntax fix in CHANGELOG (PR #199)

Add Fixed entry for the F# 8 _.property shorthand syntax support,
including the Fantomas.Core/FCS upgrade from 7.0.0 to 7.0.5.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 2 people

CHANGELOG.md

@@ -8,10 +8,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - `SynType.CreateFromLongIdent` helper in `Myriad.Core.AstExtensions`. Plugin authors can now convert a `LongIdent` to a `SynType` using this single convenience method instead of manually chaining `SynLongIdent.Create` and `SynType.CreateLongIdent`.
 
+### Fixed
+- Myriad now correctly processes input files that contain F# 8 dot-lambda (`_.property`) shorthand syntax. Previously, types using `_.` in `with member` bodies would cause a parse error:
+
+  ```
+  Fantomas.Core.ParseException: Unexpected symbol '_' in expression
+  ```
+
+  This was resolved by upgrading `Fantomas.Core` and `Fantomas.FCS` from `7.0.0` to `7.0.5`, which includes full support for `SynExpr.DotLambda`. For example, the following now works correctly:
+
   ```fsharp
-  static member CreateFromLongIdent (parent: LongIdent) =
-      SynLongIdent.Create (parent |> List.map (fun i -> i.idText))
-      |> SynType.CreateLongIdent
+  type MyType = {
+      items: MyItem list
+  } with
+      member self.itemIds = self.items |> List.map _.id
   ```
 
 ## [0.8.4]