v1.0.0-rc6

What's Changed

• doc: update docs and fix bugs by @yanghan234 in #35
• refactor: update MatterSimCalculator and Potential by @ZeroKnighting in #37
• doc: Update README.md by @yanghan234 in #38
• doc: add information on changing checkpoints by @yanghan234 in #39
• doc: Update README.md by @yanghan234 in #40
• doc: update documentations by @yanghan234 in #41
• doc: Update README.md by @yanghan234 in #42

Full Changelog: v1.0.0-rc5...v1.0.0-rc6