v0.4.0

StarkNet (Alpha 2)

• Moved from Ropsten to Goerli
• Contract interaction - contracts can invoke external functions of other L2 contracts
  • L2 contract interface
  • Get caller address system call
• Bitwise builtin is now supported in StarkNet
• Testing framework for StarkNet contract unit tests
• Patricia tree

Note: The StarkEx2.0 Cairo code was removed from the repo in this version. You may read it from a previous commit.