Update lalrpop requirement from 0.17.0 to 0.18.1

[dependabot-preview[bot]]

Updates the requirements on lalrpop to permit the latest version.

Changelog

Sourced from lalrpop's changelog.

0.18.1 (2020-03-04)

Bug Fixes

• Remove eprintln which I thought were removed (a9a775eb)

0.18.0 (2020-03-04)

Features

• Allow the tokenizer to contain custom skip regexes/literals (ee2f7060)
• states does not need to be passed to reduce actions (c156b4b2)
• action does not need to be passed to reduce actions (f69bce30)
• Only generate simulate_reduce if error recovery is used (d0a3ccba)
• Accept slices as types (#507) (c3e1cda5, closes #493)

Bug Fixes

• Avoid emitting redundant parentheses (b165fc93, closes #493)

Breaking changes

• The lexer feature is now necessary when lalrpop generates the lexer.

(2019-08-21)

Features

• Add support for allowing for mutable x in action code.

(2019-06-24)

Bug Fixes

• Accept dyn Trait as a type (#469) (cba3a746)

0.17.0 (2019-05-06)

Fixes

... (truncated)

Commits

• dd974b0 Version 0.18.1
• a9a775e fix: Remove eprintln which I thought were removed
• c044587 Fix the version in RELEASE.md
• 648185d Mention that the lexer feature is needed
• df3f428 Version 0.18.0
• 45ae391 Add clog to version updating
• 723678f Merge pull request #509 from Marwes/lexer_comment
• b22e892 Update lrgrammar
• 26932e8 Lower the required rust version
• 4447616 doc: Document lexer skipping
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

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