Update dependency github_changelog_generator to '~> 1.18.0'

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github_changelog_generator	'~> 1.17.0' → '~> 1.18.0'

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Release Notes

github-changelog-generator/github-changelog-generator (github_changelog_generator)

v1.18.0

Compare Source

Changes since v1.17.0

Fixed bugs:

• Fix critical bugs: race condition, wrong tag lookup, branch memoization, nil sections (#​1067) by @​skywinder
• Pull requests missing #​971

Closed issues:

• Undefined method map for nil:NilClass in client.branches(user_project).map #​1020
• commits_in_branch': undefined method `map' for nil:NilClass (NoMethodError) #​1016
• github-changelog-generator 1.15 Error #​758
• The link to Full Changelog is wrong #​918
• Different results when generating a CHANGELOG.md #​891

Other:

• Close issues resolved by #​1067: #​1016, #​1020, #​971, #​758, #​918 by @​skywinder

Full Changelog

This Changelog was automatically generated by github_changelog_generator

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Configuration

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🚦 Automerge: Enabled.

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