v1.2.1

Version v1.2.1 enhances the following technical improvements, preparing for the comprehensive operation of DeFi smart contracts:

1. enhance functionality with new vm native functions and tests
2. Optimize contract inheritance checks to ensure that inheritance relationships cannot be changed after deployment

Please update to the latest version as soon as possible, otherwise you may face issues with blockchain mining forks.

Note: If you encounter blockchain synchronization errors, please delete the block data and resynchronize.