reorder changelog sections

Author: ianfixes

CHANGELOG.md

@@ -18,15 +18,15 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Move repository from https://github.com/ianfixes/arduino_ci to https://github.com/Arduino-CI/arduino_ci
 - `CppLibrary` functions returning C++ header or code files now respect the 1.0/1.5 library specification
 
+### Fixed
+- Don't define `ostream& operator<<(nullptr_t)` if already defined by Apple
+- `CppLibrary.in_tests_dir?` no longer produces an error if there is no tests directory
+
 ### Deprecated
 - `arduino_ci_remote.rb` CLI switch `--skip-compilation`
 
 ### Removed
 
-### Fixed
-- Don't define `ostream& operator<<(nullptr_t)` if already defined by Apple
-- `CppLibrary.in_tests_dir?` no longer produces an error if there is no tests directory
-
 ### Security