Fix wrong "Changed" subtitle in 0.1.1 changelog

This patch fixes wrong "Changed" subtitle in the 0.1.1 changelog since
it's supposed to be called "Fixed".

Author: georgiy-belyanin

CHANGELOG.md

@@ -16,7 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added `jit` builtin Lua module annotations.
 - Added stubs for `box.schema` submodules.
 
-### Changed
+### Fixed
 
 - A few typo fixes in the `box` module and its submodules annotations.