Update unsigned-varint requirement from 0.3 to 0.4

[dependabot-preview[bot]]

Updates the requirements on unsigned-varint to permit the latest version.

Changelog

Sourced from unsigned-varint's changelog.

0.4.0 [2020-05-18]

• Update tokio-util and futures_codec (#31).

0.3.3 [2020-04-14]

• Optional support for nom has been added (#27).

0.3.2 [2020-03-04]

• Replace the optional futures dependency with a futures feature that only includes futures-io and futures-util as dependencies (#26).

0.3.1 [2020-02-17]

• Add modules io and aio to support direct reading of an unsigned-varint value from a std::io::Read or futures::io::AsyncRead type.

0.3.0 [2020-01-02]

• Update to bytes v0.5.
• Add support for tokio-util v0.2.
• Remove support for tokio-codec v0.1.
• Use #[non_exhaustive] in decode::Error and remove __Nonexhaustive.

0.2.3 [2019-10-07]

• In addition to tokio-codec, futures_codec is now supported (#18).
• decode::Error now implements Clone (#19).
• Code quality improvements (#20, #21).

0.2.2 [2019-01-31]

• Add package metadata for docs.rs to generate documentation for all features.

0.2.1 [2018-09-05]

• Ensure codec::Uvi<T> is Send when T is.

0.2.0 [2018-09-03]

• Change default value for UviBytes::max from usize::MAX to 128 MiB.

0.1.0 [2018-08-08]

Initial release

Commits

• cb903c0 Update CHANGELOG and increment version to 0.4.0
• b6f4492 Merge pull request #31 from paritytech/update-dependencies
• 9aa74f0 Update tokio-util and futures_codec.
• 0a279fe Update CHANGELOG and increment version to 0.3.3.
• b2385b0 Replace Err(e)? with Err(e.into()).
• 36961fa Merge pull request #28 from cyphar/nom-cleanup
• 830cb1c nom: remove needless *_buffer arguments to macro
• bdf9b28 Merge pull request #27 from cyphar/nom-support
• 0100b65 tests: add unit tests for nom parser
• f95cd18 nom: add a basic nom parser for unsigned-varint
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Looks like unsigned-varint is up-to-date now, so this is no longer needed.