Including Spache Readability Score

[DonaldTsang]

See https://github.com/DaveChild/Text-Statistics

[cdimascio]

@DonaldTsang Thanks for the issue. Adding Spache is great idea. Let me know if you are interested in taking the first stab at the implementation. PRs are always welcome!

Note that all scorers follow a very similar implementation pattern: The following use ARI as an example

• each scorer lives in the scorers directory
• each scorer has a constructor that takes statistics and is registered here.
• each scorer implements a method score and returns a Result. See ARI for an example
• each scorer provides a test(s) in test/test_readability

[cdimascio]

@DonaldTsang Spache is now implemented in version 1.4.1 Thanks for your interest in this project