Update dependency @nomiclabs/hardhat-etherscan to v3.1.8

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This PR contains the following updates:

Package	Change	Age	Confidence
@nomiclabs/hardhat-etherscan (source)	3.1.0 -> 3.1.8

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Release Notes

nomiclabs/hardhat (@​nomiclabs/hardhat-etherscan)

v3.1.8

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v3.1.7: @​nomiclabs/hardhat-etherscan v3.1.7

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This version of hardhat-etherscan improves how already verified contracts are handled. In previous versions, verification would be attempted and an error would be returned by the server. Starting from this version, the plugin will detect that the contract is already verified and show a message informing the user about this. Thanks @​OptimusOpus for working on this!

Besides that, this version adds support for Gnosis Chain's Chiado testnet.

v3.1.6

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Changes

• 070abb7: Added support for the http_proxy environment variable. When this variable is set, hardhat-etherscan will use the given proxy to send the verification requests.

v3.1.5: @​nomiclabs/hardhat-etherscan v3.1.5

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This release upgrades the version of undici used by the hardhat-etherscan plugin.

v3.1.4: @​nomiclabs/hardhat-etherscan v3.1.4

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Added a warning when the etherscan config is mistakenly included in the networks object instead of being at the root of the config.

v3.1.3: @​nomiclabs/hardhat-etherscan v3.1.3

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Added a --no-compile flag to the verify task (thanks @​spalladino!)

v3.1.2: @​nomiclabs/hardhat-etherscan v3.1.2

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• Added Arbitrum Goerli to the list of supported networks.
• Fixed an issue with the URLs used for Optimism Goerli.

v3.1.1: @​nomiclabs/hardhat-etherscan v3.1.1

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This version makes two changes to the networks supported by default:

• A new gnosis network was added, that works as an alias for xdai (thanks @​alebanzas!)
• The deprecated Optimism Kovan network was removed in favor of the Optimism Goerli network (thanks @​shanefontaine)

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