Fix fees overwrite in starkware plugin (#198)

* increase display buffer size to handle Starkware master key and control size when using snprintf

* Bump version 1.9.6

* Fix broken tests

* Add first starkware tests

* Add some constants for starkware

* Update CHANGELOG.md

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.9.6](https://github.com/ledgerhq/app-ethereum/compare/1.9.5...1.9.6) - 2021-9-29
+
+### Fixed
+
+- Fixed a bug where fees displayed were wrong on Starkware transactions
+
 ## [1.9.5](https://github.com/ledgerhq/app-ethereum/compare/1.9.4...1.9.5) - 2021-9-27
 
 ### Changed