v1.3.3

Bugfixes regarding multiplexed signals:
- don't crash when decoding of a received message fails
  commit 5d8f0c883fd47156d27aab8bd8cd792e973fd852
- don't crash when trying to send message with multiplexed signals
  commit 0bd0ade74afd3987221b33a42bddb5fbfd918f8d