Add CHANGELOG entries for the new executor

CHANGELOG.md

@@ -7,9 +7,16 @@ and this project adheres to
 [Haskell Package Versioning Policy](https://pvp.haskell.org/).
 
 ## [Unreleased]
-### Fixed
+### Added
-- Provide a custom `Show` instance for `Type.Definition.Value` (for error
+- Custom `Show` instance for `Type.Definition.Value` (for error
   messages).
+- Path information in errors (path to the field throwing the error).
+
+### Fixed
+- Error messages are more concrete, they also contain type information and
+  wrong values, where appropriate and possible.
+- If the field with an error is Non-Nullable, the error is propagated to the
+  first nullable field, as required by the specification.
 
 ## [1.0.0.0]
 ### Added

src/Language/GraphQL/AST/DirectiveLocation.hs

@@ -1,7 +1,3 @@
-{- This Source Code Form is subject to the terms of the Mozilla Public License,
-   v. 2.0. If a copy of the MPL was not distributed with this file, You can
-   obtain one at https://mozilla.org/MPL/2.0/. -}
-
 {-# LANGUAGE Safe #-}
 
 -- | Various parts of a GraphQL document can be annotated with directives. 

src/Language/GraphQL/Type/Definition.hs

@@ -1,3 +1,7 @@
+{- This Source Code Form is subject to the terms of the Mozilla Public License,
+   v. 2.0. If a copy of the MPL was not distributed with this file, You can
+   obtain one at https://mozilla.org/MPL/2.0/. -}
+
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE Safe #-}