protocol - a71c356

@0x/asset-swapper@4.8.0

• Moved Bridge addresses into Asset-swapper (#4)
• Updated Sampler to Solidity 0.6 (#4)

@0x/contract-addresses@5.0.0

• Moved Bridge addresses into Asset-swapper (#4)

@0x/contracts-asset-proxy@3.6.0

• Add SwerveBridge and SnowSwapBridge (duplicate of CurveBridge) (#2707)

@0x/contracts-zero-ex@0.5.0

• Add Swerve, SnowSwap, DODO and SushiSwap into FQT (#7)