Add changelog

Author: mosuem

pkgs/string_scanner/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.4.1
+
+* Move to `dart-lang/tools` monorepo.
+
 ## 1.4.0
 
 * Fix `LineScanner`'s handling of `\r\n`'s to preventing errors scanning

pkgs/string_scanner/pubspec.yaml

@@ -1,5 +1,5 @@
 name: string_scanner
-version: 1.4.0
+version: 1.4.1
 description: A class for parsing strings using a sequence of patterns.
 repository: https://github.com/dart-lang/tools/tree/main/pkgs/string_scanner