v0.4.3

Warning: this release is broken, use 0.4.4+ instead.

What's Changed

• specify TraitError in test by @kushalkolar in #85
• allow setting the cursor by @kushalkolar in #84
• Use tuples for buttons and modifiers (instead of list) by @almarklein in #88

Full Changelog: v0.4.2...v0.4.3