[v0.0.4] Improve `BatchDict`

What's Changed

• Add items, keys and values to BatchDict by @durandtibo in #279
• Refactor nightly workflows by @durandtibo in #280
• Add __contains__ and get to BatchDict by @durandtibo in #281
• Update dependencies by @durandtibo in #283
• Add citation and update dependencies by @durandtibo in #284
• Fix link in citation by @durandtibo in #285
• Reformat code blocks by @durandtibo in #286
• Add __iter__ and __len__ to BatchDict by @durandtibo in #287
• Release version 0.0.4 by @durandtibo in #288

Full Changelog: v0.0.3...v0.0.4