0.4.0

What's Changed

• Update README.md by @SchrodingersGat in #23
• Store metadata by @SchrodingersGat in #24
• Bump version number to 0.4.0 by @SchrodingersGat in #25
• Add "source file" to metadata by @SchrodingersGat in #27
• Style fixes by @SchrodingersGat in #28
• Report context by @SchrodingersGat in #30

Full Changelog: 0.3.3...0.4.0