3.0.0

• Update and refinement of the bounds_mode option. There are now four options:
  • Ignore bounds (default)
  • Scalar
  • Vector
  • Wall
• Added a new option norm_mode to specify how to compute the norm of the function vector to check for convergence. There are three options:
  • 2-norm (default)
  • infinity-norm
  • 1-norm
• Updates to readme, docstrings, and tests.