bump patch version to 0.3.3

Merge pull request #15 from valadaptive/tight-bounds

Update documentation for Mask::offset

Merge pull request #14 from waywardmonkeys/fix-doc_overindented_list_items-lint

Compute tight placement bounds

Fix `clippy::doc_overindented_list_items` lint

bump patch version for release (0.3.2)

Merge pull request #13 from waywardmonkeys/update-licensing-info

Correct licensing info

Merge pull request #12 from waywardmonkeys/update-rust-edition

Update to Rust 2021 edition

Merge pull request #11 from waywardmonkeys/improve-docs

Use intradoc links, fix missing backticks.

Merge pull request #10 from waywardmonkeys/fix-manual_clamp-lints

Fix `clippy::needless_lifetimes` lints