Version 0.4.0

What's Changed

• Tests run in random order by @lrntct in #2
• Improve time handling by @lrntct in #3
• to_grass: transpose dimensions by @lrntct in #4
• Implement lazy loading for stds by @lrntct in #5
• Support time units in relative time stds by @lrntct in #6
• Remove the grass session management from the package by @lrntct in #8

Full Changelog: v0.3.0...v0.4.0