v4.3.0

This release updates DepositableDelegateProxy for Istanbul contexts.

Due to EIP-1884's gas increases, previous versions of the proxies will no longer accept direct ETH transfers from contracts using .transfer() or .send().

Fixes

• Optimize DepositableDelegateProxy for EIP-1884 (#551) @izqui
• Add safe total supply to SafeERC20 (#543) @facuspagnuolo

Chores

• Add gas check report in CI (#547) @cgewecke
• Upgrade solidity-coverage to v0.6+ (#541) @sohkai