Revert "Update v1.2"

This reverts commit aa12f2ef64e5cc9c86e136c9e12066c8ec6deddf.
Revert "Update README.md"

This reverts commit f4bbb521c552a4730d99b910d4109efa20f4b560.
Revert "Update v1.2"

This reverts commit a6a4d3df22da76150ef7e46c9f73c3fd32c110bd.
Revert "Update v1.2"

This reverts commit c3c98635e37b6ed479846ef266319cd852b31b10.