BURGER [Burger Swap] Token

upgradeImpl(address) should be declared external:
- UpgradableProduct.upgradeImpl(address) (#200-206)
upgradeGovernance(address) should be declared external:
- UpgradableGovernance.upgradeGovernance(address) (#223-229)
incNounce() should be declared external:
- ERC2917Impl.incNounce() (#317-319)
Use the external attribute for functions never called from the contract.

Additional information: link

Parameter UpgradableProduct.upgradeImpl(address)._newImpl (#200) is not in mixedCase
Parameter UpgradableGovernance.upgradeGovernance(address)._newGovernor (#223) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

SafeMath.mod(uint256,uint256) (#161-163) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (#177-180) is never used and should be removed
Remove unused functions.

Additional information: link

solc-0.6.6 is not recommended for deployment
Deploy with any of the following Solidity versions: 0.5.16 - 0.5.17, 0.6.11 - 0.6.12, 0.7.5 - 0.7.6 Use a simple pragma version that allows any of these versions. Consider using the latest version of Solidity for testing.

Additional information: link

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