chore: remove changelogs from gitignore

Author: lizschwab

.gitignore

@@ -11,7 +11,6 @@ build-debug.log
 /nbproject/private/
 tsdoc-metadata.json
 .vscode
-/CHANGELOG.md
 
 # All packages
 build/
@@ -24,7 +23,6 @@ packages/blockly/tests/compile/main_compressed.js
 packages/blockly/tests/compile/main_compressed.js.map
 packages/blockly/tests/mocha/test-modules.generated.mjs
 packages/blockly/temp/
-packages/blockly/CHANGELOG.md
 
 # Docs:
 # Autogenerated reference docs, do not check in