update license

Signed-off-by: Francesco <[email protected]>

README.md

@@ -118,6 +118,9 @@ TokenFlow enables several key optimizations and use cases:
    - Works with standard ERC20 tokens
    - Works with fee-on-transfer tokens
 
-## License
 
-UNLICENSED
+
+## Acknowledgements
+
+- [0x Allowance Holder](https://github.com/0xProject/0x-settler/tree/master/src/allowanceholder) for the idea of transient storage allowance.
+- [Permit2](https://github.com/Uniswap/permit2)

script/TokenFlow.s.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.8.13;
 
 import {Script, console} from "forge-std/Script.sol";

src/TokenFlow.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.8.28;
 
 import {ITokenFlow, Constraint, BadNetflows, InvalidScope, IFlowScope} from "src/ITokenFlow.sol";

src/TransientNetflows.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.8.28;
 
 import {EfficientHashLib} from "solady/utils/EfficientHashLib.sol";

test/TokenFlow.t.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.8.28;
 
 import {Test} from "forge-std/Test.sol";

test/TransientNetflows.t.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.8.28;
 
 import {Test} from "forge-std/Test.sol";

test/mocks/MockERC20.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.8.28;
 
 import {ERC20} from "solady/tokens/ERC20.sol";

test/mocks/MockFlowScope.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.8.28;
 
 import {IFlowScope, Constraint} from "src/ITokenFlow.sol";