v1.20

v1.20 (7th January 2019):

• Now supports character literals in expressions. Thanks to untaugh for the pull request
  adding this.
• Stopped the default collapsing of whitespace in output, and made it optional via a
  new command line option --compress.
• Fixed extraneous whitespace in --passthru-comments caused by multiline comments.
  Thanks to p2k for reporting this.
• Fixed bug where defining a macro via string did not set the source attribute in the
  token. Thanks to ZedThree for reporting this.
• Stop triggering an exception when no arguments are supplied to pcpp. Thanks to
  virtuald for reporting this.
• Rebase onto PLY latest from Dec 28th 2018 (dabeaz/ply@a37e083). Latest
  PLY no longer works using pypi packaging, David wants people to include the source of
  PLY directly. pcpp does this via a git submodule, and has setuptools bundle the submodule.
• Add a formal LICENSE.txt file, as requested by Sei-Lisa.
• Fix failure to issue #line directive for first include file in a file. Thanks to
  Sei-Lisa for reporting this.