1.4.0

What's Changed

• use new pytest-asdf-plugin by @braingram in #478
• use new terminology to disambiguate "standard" by @braingram in #473
• Add datatype-1.0.0 schema by @braingram in #455
• add galexsec, reorganize time formats by @braingram in #480
• fix time-1.4.0 by @braingram in #481

Full Changelog: 1.3.0...1.4.0