v0.5.2: add an option to denoise scATACseq

What's Changed

• clip the predicted ambient counts by @CaibinSh in #60
• new release by @CaibinSh in #61
• Default clip_to_obs to False by @CaibinSh in #63
• feat: add a feature/tutorial for denoising scATACseq by @CaibinSh in #65

Full Changelog: v0.5.0...v0.5.2