What's Changed
- resolves issue https://github.com/rsgalloway/envstack/issues/30
- removes unnecessary quoting in some env files
- stack dedupe when loading sources
- updated tests, adds some todos
- convert keys to strs when sorting in cli
- bumps version to 0.7.3
**Full Changelog**: https://github.com/rsgalloway/envstack/compare/0.7.2...0.7.3