Update package setup (#389)

* Update installation

* Avoid duplicate builds

* Remove `requirements.txt`

Update CI to use Python 3.8 through 3.10 (#386)

* Try to build on Python 3.8 and 3.9

* Delete .travis.yml

* Update ci.yaml

* Don't duplicate CI runs on push and pull_request

* Update Python versions following NEP 29

* Unpin actions versions

* Include version targets as they are required

* Turn off macOS + Python 3.10 tests

* Cleanup

Set up GitHub Actions CI (#367)

* MAINT: Bump Python versions in CI

* Set up GitHub Actions CI

* Fix test env name

* Drop coverage in tests and Python 3.8

* Add travis back, update miniconda URL

* curl -> wget

* Fix URL

* Fix env name

* Fix typo

* Fix typo

* Update script to cookiecutter

* Fix brew