v1.0.0

Graphile Migrate has proven itself stable; so it's finally time to bump it to v1 🎉

No breaking changes.

New features in this release:

• Added support for .gmrc.js file; alternative to .gmrc JSON5 file.

Fixes:

• graphile-migrate run automatically use GM_DBURL instead of connectionString when called from an action
• Lots of documentation improvements