parser for 'pyproject.toml' file

 Tool developed to parse the pyproject.toml file. In addition to the parsing
 library, pyproject-parser has a command-line interface for validating and
 reformatting pyproject.toml files.
 .
 main features:
  - Returns a string representation of the PyProject.
  - Write as TOML in the provided file.
  - Serializes to TOML.
  - Constructs an instance of PyProject from a dictionary.
  - Loads the pyproject.toml configuration mapping from the provided file.
  - Reformats the provided pyproject.toml file.
  - Resolves the file key in the readme and the license (if present) to recover
    the contents of the file.