v4.3.0

• #87 Add a lock on a transport which prevents race condition to occur if you call twice an async method on a hw-app-* . For instance, you sign a transaction and at the same time, without waiting its completion, you call another method like "get public address". The apdu commands could have been interleaved and unexpected problem could occur on user side. The lock will make any concurrent calls to throw an exception to prevent such race condition to happen.
• hw-app-str: Detect attempt at signing multi-op Stellar transaction and throw descriptive error : #99 by @lenondupe
• bunch of improvments in our internal currencies library (formatShort, localization, icons update,..)