Update changelog

Author: fhammerschmidt

CHANGELOG.md

@@ -27,6 +27,7 @@
 - Fix invalid range for `definition`. https://github.com/rescript-lang/rescript-vscode/pull/781
 - Don't emit object keys in uppercase as namespace. https://github.com/rescript-lang/rescript-vscode/pull/798
 - Fix accidental output of extra `|` when producing exhaustive switch code for polyvariants. https://github.com/rescript-lang/rescript-vscode/pull/805
+- Fix JS syntax highlighting in single-line FFI extension points. https://github.com/rescript-lang/rescript-vscode/pull/807
 
 ## 1.18.0