Adding support for ERC 1271#33

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Muhammad-Altabba wants to merge 6 commits intouport-project:developfrom

Muhammad-Altabba:Adding-Support-for-ERC-1271

Commits on Sep 8, 2020

Upgrade truffle to version 5.1.43
maltabba
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Add `checkSignature' overloading that is compatible with `ERC1271`
maltabba
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small fixes for IERC1271 usage
maltabba
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Add methods overloading to EthereumDIDRegistry.sol for compatibility with ERC1271
maltabba
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Commits on Sep 10, 2020

Adding test cases Signed methods
maltabba
committed

Commits on Sep 14, 2020

Write tests for using Contract Signature at `EthereumDIDRegistry`
maltabba
committed