Wonderwords 2.2

Wonderwords 2.2 is out!

Added

• Added CHANGELOG.md.
• Added custom word categories.
• The Rich library is now an optional dependency.
• Bumped dependency version numbers.
• Added a list of profanities.
• Refactored code.
• Removed profanities by default.
• Added singular forms of categories as default such as "noun" instead of
  "nouns".

Changed

• Changed the implementation behind the scenes. Now, word lists are loaded once
  and reused between instances of the RandomWord class. This is more
  efficient.
• Changed the implementation of RandomSentence to make up for the changes in
  RandomWord.
• RandomWord.parts_of_speech will soon be deprecated.
• The include_parts_of_speech argument for RandomWord methods will soon be
  deprecated. The alternative is now include_categories.

Fixed issues

• #8
• #9