message: Release helper: Abort on error
diff: # release-helper.sh - maintainer utility script to change
  # the library version and update all copyright dates
  -# by carstene1ns 2020, released under the MIT license
  +# by carstene1ns 2021, released under the MIT license
  +
  +set -e
  year=$(date +%Y)
  version=$1
  