add support for meta transactions

[strumswell]

fixes #98

With ethr-did-resolver getting its 6.2.0 update, I updated this dependency to reflect the underlying additions. This includes wrapping the create hash function and the corresponding signed methods doing the txs. Also added tests for it.

Let me know what you think!

[strumswell]

Made the requested changes! Are we good now?

[mirceanis]

Made the requested changes! Are we good now?

Almost :)

The gasLimit parameter that is deprecated in existing methods should not be copied to the new *Signed methods. Users should be using txOptions.gasLimit instead. Please add the @deprecated hints back for the existing methods and remove the gasLimit parameter from the new methods.

[strumswell]

Made the requested changes! Are we good now?

Almost :)

The gasLimit parameter that is deprecated in existing methods should not be copied to the new *Signed methods. Users should be using txOptions.gasLimit instead. Please add the @deprecated hints back for the existing methods and remove the gasLimit parameter from the new methods.

My bad, thanks for pointing this out. 😅

[strumswell]

Thank you so much for taking your time going through this! I had some time now and included all your suggestions but:

• Didn't including the MetaTransaction type. I saw you already released a new version of the resolver that exports it. So bumped its version in the package and imported from there.
• Made txOptions parameter in changeOwnerSigned non-optional to be in line with the other signed methods.
• Removed usage of address. You are not using this at all in other places so I just resolved them back to their underlying string type. Then we also don't have to export this type anywhere.

[codecov[bot]]

Codecov Report

Base: 87.96% // Head: 84.56% // Decreases project coverage by -3.39% :warning:

Coverage data is based on head (ad82bf5) compared to base (180c65c). Patch coverage: 77.77% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #102 +/- ## ========================================== - Coverage 87.96% 84.56% -3.40% ========================================== Files 1 1 Lines 108 162 +54 Branches 41 59 +18 ========================================== + Hits 95 137 +42 - Misses 13 25 +12 ``` | [Impacted Files](https://codecov.io/gh/uport-project/ethr-did/pull/102?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uport-project) | Coverage Δ | | |---|---|---| | [src/index.ts](https://codecov.io/gh/uport-project/ethr-did/pull/102/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uport-project#diff-c3JjL2luZGV4LnRz) | `84.56% <77.77%> (-3.40%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uport-project). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uport-project)

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[uport-automation-bot]

:tada: This PR is included in version 2.3.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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