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Add ERC-2771 support
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‎CHANGELOG.md‎

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Please follow https://changelog.md/ conventions.
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## v0.2.0
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- Add ERC-2771 support
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## v0.1.0
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- 🎉 first release!

‎README.md‎

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| 🛑 | Function can modify state |
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| 💵 | Function is payable |
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## Gasless support (ERC-2771)
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The DebtEngine supports client-side gasless transactions using the [Gas Station Network](https://docs.opengsn.org/#the-problem) (GSN) pattern, the main open standard for transfering fee payment to another account than that of the transaction issuer. The contract uses the OpenZeppelin contract `ERC2771ContextUpgradeable`, which allows a contract to get the original client with `_msgSender()` instead of the fee payer given by `msg.sender` while allowing upgrades on the main contract (see *Deployment via a proxy* above).
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At deployment, the parameter `forwarder` inside the constructor has to be set with the defined address of the forwarder. Please note that the forwarder can not be changed after deployment.
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Please see the OpenGSN [documentation](https://docs.opengsn.org/contracts/#receiving-a-relayed-call) for more details on what is done to support GSN in the contract.
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## Dependencies
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The toolchain includes the following components, where the versions are the latest ones that we tested:

‎doc/coverage/coverage/index-sort-b.html‎

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</tr>
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<td class="headerItem">Date:</td>
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<td class="headerItem">Functions:</td>
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<td class="headerCovTableEntry">10</td>
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<td class="headerCovTableEntryMed">80.0 %</td>
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<td class="tableHead" colspan=2>Functions <span class="tableHeadSort"><a href="index-sort-f.html"><img src="updown.png" width=10 height=14 alt="Sort by function coverage" title="Sort by function coverage" border=0></a></span></td>
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<td class="tableHead" colspan=2>Branches <span class="tableHeadSort"><img src="glass.png" width=10 height=14 alt="Sort by branch coverage" title="Sort by branch coverage" border=0></span></td>
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<table border=0 cellspacing=0 cellpadding=1><tr><td class="coverBarOutline"><img src="emerald.png" width=95 height=10 alt="95.5%"><img src="snow.png" width=5 height=10 alt="95.5%"></td></tr></table>
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<td class="coverPerMed">85.7&nbsp;%</td>
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<td class="coverPerHi">95.5&nbsp;%</td>
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<td class="coverPerMed">80.0&nbsp;%</td>
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‎doc/coverage/coverage/index-sort-f.html‎

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<td class="headerCovTableEntry">21</td>
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<td class="headerCovTableEntryHi">95.5 %</td>
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<td class="headerItem">Date:</td>
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<td class="headerItem">Functions:</td>
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<td class="tableHead" colspan=2>Functions <span class="tableHeadSort"><img src="glass.png" width=10 height=14 alt="Sort by function coverage" title="Sort by function coverage" border=0></span></td>
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<td class="tableHead" colspan=2>Branches <span class="tableHeadSort"><a href="index-sort-b.html"><img src="updown.png" width=10 height=14 alt="Sort by branch coverage" title="Sort by branch coverage" border=0></a></span></td>
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<table border=0 cellspacing=0 cellpadding=1><tr><td class="coverBarOutline"><img src="emerald.png" width=95 height=10 alt="95.5%"><img src="snow.png" width=5 height=10 alt="95.5%"></td></tr></table>
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<td class="coverPerMed">85.7&nbsp;%</td>
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‎doc/coverage/coverage/index-sort-l.html‎

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<td class="tableHead" colspan=2>Functions <span class="tableHeadSort"><a href="index-sort-f.html"><img src="updown.png" width=10 height=14 alt="Sort by function coverage" title="Sort by function coverage" border=0></a></span></td>
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<td class="tableHead" colspan=2>Branches <span class="tableHeadSort"><a href="index-sort-b.html"><img src="updown.png" width=10 height=14 alt="Sort by branch coverage" title="Sort by branch coverage" border=0></a></span></td>
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‎doc/coverage/coverage/index.html‎

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<td class="tableHead" colspan=2>Branches <span class="tableHeadSort"><a href="index-sort-b.html"><img src="updown.png" width=10 height=14 alt="Sort by branch coverage" title="Sort by branch coverage" border=0></a></span></td>
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‎doc/coverage/coverage/script/Counter.s.sol.func-sort-c.html‎

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