hotfix to make puz.__version__ match package version

Hotfix for problem with build packaging in 0.3.0 -- missing puz.py module.

What's Changed

• new Grid helper class to simplify access to clues
• support for reading and writing files in AcrossLite text format
• version parameter to Puzzle constructor
• bug fix (courtesy @afontenot) to allow serialized dicts to have ':' in values

Full Changelog: v0.2.6...v0.3.0

Full Changelog: v0.2.5...v0.3.0-rc

• Add NotProvided value to SolutionState enum for puzzles without a solution
• typo in Markup.is_markup_square
• utf-8 support for v2 files
• various fixes for diagramless

• added support for puz file version 1.4