• Python 3.11 compatibility (by @ppdms)
• Include Python 3.11 in GitHub Actions

• Rename entities -> boards
• Fix StopIteration sporadically raised by Unique Rectangle
• Rewrite renderers
• Bump coverage to 100%

Search for Locked Candidates in all groups

• Rename min_rank to avg_rank
• Split CI workflows
• Add badges to README

• Sudoku can be represented as string
• Sudoku can be initialised from string
• New step-by-step solver
• Fix naming:
  • techniques.Result -> techniques.Step
  • generator.generate -> generators.random_sudoku
• BoxSize is required in every Sudoku constructor

• Sudoku Generator
• Sudoku Ranking
• Backtracking based solver
• Elimination based solver

• Cell is the only class to represent cell in the grid (Mark class is removed)
• Sudoku class acts like container now, empty cells don't have candidates when instantiated
• Added new technique - PencilMarking - to fill candidates for empty cells
• Omission renamed to LockedCandidate