pygfx/rendercanvas: v2.6.2

What's Changed Prevent exceptions when closing wx canvas by @almarklein in https://github.com/pygfx/rendercanvas/pull/182 Refactor to put core modules in subpackage by @almarklein in https://github.com/pygfx/rendercanvas/pull/184 Add contribution guide by @almarklein in https://github.com/pygfx/rendercanvas/pull/187 Always request a draw on a resize & bump patch version by @almarklein in https://github.com/pygfx/rendercanvas/pull/188 Full Changelog: https://github.com/pygfx/rendercanvas/compare/v2.6.1...v2.6.2