Update combine requirement from ~4.3 to ~4.5

[dependabot-preview[bot]]

Updates the requirements on combine to permit the latest version.

Changelog

Sourced from combine's changelog.

v4.5.1 (2020-12-27)

Bug Fixes

• Correct the tokio-02 feature (466a50d3)

v4.5.0 (2020-12-25)

Features

• Remove pin-project-lite from the 'std' feature (32ef87b0)
• Add async decoding for tokio version 1 (8e91f57d)

v4.4.0 (2020-11-18)

Features

• Add support for decoding using tokio_03 (ce1612ff)
• Add a length_prefix combinator (9e343b2a, closes #297)
• Add a spanned combinator (1a70f3f4)
• Add a spanned combinator (9a8fead8)
• Allow conversion between errors with different token,range,position types (65fe0af2, breaks #)

Breaking Changes

• Allow conversion between errors with different token,range,position types (65fe0af2, breaks #)

v4.3.2 (2020-09-08)

v4.3.1 (2020-08-26)

Bug Fixes

Commits

• 2bac133 (cargo-release) version 4.5.1
• d0bea63 Updated changelog
• 466a50d fix: Correct the tokio-02 feature
• ea70d7d Merge pull request #310 from Marwes/tokio
• 57c7ab6 cargo update
• 306d423 (cargo-release) start next development iteration 4.5.1-alpha.0
• de5cde0 (cargo-release) version 4.5.0
• 8ac9752 Updated changelog
• 50e616d Fix warning
• 32ef87b feat: Remove pin-project-lite from the 'std' feature
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #307.