v1.0.0

Breaking changes:

• Removed support for Python 3.6.
• -po option of md2po has been renamed to -p.
• --plaintext option of md2po does not offer the contraction -p now.
• -mo contraction of --mo-filepath option of md2po has been removed.
• Now only one X-Generation header with the value mdpo v{version} is added when using the option --xheader of md2po (--xheaders option has been renamed to --xheader).
• Changed name of --pre-commit option by --check used to return exit code 1 if any of the files have changed.
• Removed mdpo.__version__, mdpo.__title__ and mdpo.__description__ (use importlib.metadata or importlib_metadata).
  Replace with something like:

  import sys
  
  if sys.version_info > (3, 7):
      import importlib.metadata as importlib_metadata
  else:
      import importlib_metadata
  
  metadata = importlib_metadata.distribution("mdpo").metadata
  __version__ = metadata["version"]  # or just `importlib_metadata.version("mdpo")` 
  __title__ = metadata["name"]
  __description__ = metadata["summary"]