Update plum-dispatch requirement from <2,>=1.5.1 to >=1.5.1,<3

Created by: dependabot[bot]

Updates the requirements on plum-dispatch to permit the latest version.

Release notes

Sourced from plum-dispatch's releases.

v2.0.0

At last, Plum 2!

See #73 and #68.

Commits

• 396b23f Merge pull request #73 from wesselb/plum2
• ad22e9c Update README
• 9493f7c Optimise is_faithful for ABCMeta
• 78be04b Fix typo
• d84f324 Opt into O(n) strategy
• 3aedd55 Fix backward compatibility
• e6d85e4 Fix test
• c5ea7bd Address warning for Literals
• d2fcea5 Remove unnecessary __faithful__
• 0f2c6ce Update docs
• Additional commits viewable in compare view

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