Update yamllint requirement from <1.20,>=1.11.1 to >=1.11.1,<1.21

[dependabot-preview[bot]]

Updates the requirements on yamllint to permit the latest version.

Changelog

Sourced from yamllint's changelog.

1.20.0 (2019-12-26)

• Add --no-warnings option to suppress warning messages
• Use 'syntax' as rule name upon syntax errors

1.19.0 (2019-11-19)

• Allow disabling all checks for a file with # yamllint disable-file

1.18.0 (2019-10-15)

• Lint .yamllint config file by default
• Also read config from .yamllint.yml and .yamllint.yaml
• Improve documentation for yaml-files
• Update documentation for pre-commit
• Explicitly disable empty-values and octal-values rules

1.17.0 (2019-08-12)

• Simplify installation instructions in the README
• Add OpenBSD installation instructions
• Make YAML file extensions configurable

1.16.0 (2019-06-07)

• Add FreeBSD installation instructions
• Fix the line rule to correctly handle DOS new lines
• Add the allowed-values option to the truthy rule
• Allow configuration options to be a list of enums

1.15.0 (2019-02-11)

• Allow linting from standard input with yamllint -

1.14.0 (2019-01-14)

• Fix documentation code snippets
• Drop Python 2.6 and 3.3 support, add Python 3.7 support
• Update documentation and tests for line-length + Unicode + Python 2
• Allow rule configurations to lack options
• Add a new ignore-shebangs option for the comments rule

1.13.0 (2018-11-14)

... (truncated)

Commits

• 13a0f11 yamllint version 1.20.0
• 43b95e9 Use 'syntax' as rule name upon syntax errors
• 8fa9eb3 Add --no-warnings option to suppress warning messages
• da3788e yamllint version 1.19.0
• fb400dc Allow disabling all checks for a file
• 92324ae yamllint version 1.18.0
• 7359785 fix(default.yaml): disable empty-values & octal-values by default
• 579a975 docs: Fix pre-commit config file
• f3d9196 docs(configuration): improve yaml-files code example
• 881d301 feat: Support reading config from .yamllint.yml and .yamllint.yaml
• Additional commits viewable in compare view

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