[arduino] chore: update changelog and merge #93 from master

Author: sleepdefic1t

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Changed
 
+- changed amount and fee Json serialization to match Core v.2.5 ([#111])
 - improved PlatformIO configuration ([#101])
 - improved formatting and maintainability ([#98])
 - improved Slots implementations ([#92])