old_contents: # This file is suitable for sourcing inside POSIX shell, e.g. bash as
  # well as for importing into Python
  VERSION="v0.18.11"  # NOQA
  
new_contents: # This file is suitable for sourcing inside POSIX shell, e.g. bash as
  # well as for importing into Python
  VERSION="v0.18.12"  # NOQA
  
subject: increase version number