v0.9.1
* Downgrade to 2018 edition for MSRV reasons * Check support for 1.53 in CI * Make CI more efficient by avoiding mostly unnecessary checks * Bump version number to 0.9.1 * Update changelog
* Downgrade to 2018 edition for MSRV reasons * Check support for 1.53 in CI * Make CI more efficient by avoiding mostly unnecessary checks * Bump version number to 0.9.1 * Update changelog