release with recent improvements

What's Changed

• sync with new pytorch code by @youkaichao in #47
• add Developer Documentation by @youkaichao in #48
• improve doc with overall architecture by @youkaichao in #49
• add codecov by @youkaichao in #51
• add architecture diagram by @youkaichao in #52
• add more files in coverage by @youkaichao in #54
• remove stale code and add more tests by @youkaichao in #55
• add more tests by @youkaichao in #56
• add codecov config by @youkaichao in #57
• add depyf.optimization and tests by @youkaichao in #58
• add an optimization tutorial by @youkaichao in #59
• fix documentation format by @youkaichao in #60
• add api reference doc by @youkaichao in #61
• keep up-to-date with recent pytorch by @youkaichao in #64
• fix previous pytorch version by @youkaichao in #65
• Add epilogue lambda guards by @imShZh in #67
• use mixed underscore and dot by @youkaichao in #70
• fix a bug in checking wrong object's type by @imShZh in #66
• Update .gitignore for tests output by @zincnode in #71
• Do not crash on torch.export by @gilfree in #73
• use print_readable for submodules by @youkaichao in #74

New Contributors

• @imShZh made their first contribution in #67
• @zincnode made their first contribution in #71
• @gilfree made their first contribution in #73

Full Changelog: v0.17.0...v0.18.0