Updates to be compatible with numpy2
What's Changed
* syntax highlighting in README.md by megies in https://github.com/crotwell/simplemseed/pull/3
* numpy v2 compatibility by megies in https://github.com/crotwell/simplemseed/pull/2
* README: add install notes by megies in https://github.com/crotwell/simplemseed/pull/4
New Contributors
* megies made their first contribution in https://github.com/crotwell/simplemseed/pull/3
**Full Changelog**: https://github.com/crotwell/simplemseed/compare/v0.3.1...v0.4.0