Update dependency gulp-eslint to v6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gulp-eslint	devDependencies	major	0.9.0 -> 6.0.0

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Release Notes

adametry/gulp-eslint

v6.0.0

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• Bump eslint dependency to ^6.0.0 https://eslint.org/blog/2019/06/eslint-v6.0.0-released
• Drop support for Node 6 and 7

v5.0.0

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• Bump eslint dependency to ^5.0.0 https://eslint.org/blog/2018/06/eslint-v5.0.0-released
• Use destructuring assignment to simplify the code

v4.0.2

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• Update plugin-error to ^1.0.0

v4.0.1

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• Make fix option work even if quiet option is also enabled
• Remove deprecated gulp-util dependency and use individual modules instead

v4.0.0

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• Drop support for linting Stream contents
  • Because almost all, at least widely used tools to handle JavaScript files don't support Streams. They only support either String or Buffer.
• Use Buffer.from(<string>) instead of the deprecated new Buffer(<string>)
  • Note that Buffer.from is only available on Node.js >= 4.5.0.
• Bump eslint dependency to ^4.0.0
• Emit a PluginError when it fails to load an ESLint plugin

v3.0.1

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• Remove unnecessary object-assign dependency

v3.0.0

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• Bump eslint dependency to ^3.0.0 https://eslint.org/blog/2016/07/eslint-v3.0.0-released
• Use ES2015 syntax
• Remove these deprecated option aliases:
  • global
  • env
  • config
  • rulesdir
  • eslintrc
• Drop support for non-array globals option

v2.1.0

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• Remove now obsolete error handling for formatter loading
  • It's gracefully done in ESLint >=v2.10.0. eslint/eslint#​5978

v2.0.0

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• Update to ESLint 2.0.0, along with other dependency updates
• Replace JSCS with ESLint equivalent rules

v1.1.1

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• Fix config migration of "extends" and "ecmaFeatures" options

v1.1.0

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• Bump eslint dependency to ^1.4.0, when "fix" option was added
• Apply eslint-fixed source to gulp file contents
• Add "quiet" option to filter eslint messages
• Update .eslintignore resolution to match eslint
• Add file ignore warnings behind "warnFileIgnored" option
• Migrate "ecmaFeatures" and "extends" option to "baseConfig" option
• Add "result" and "results" methods and tests
• Refactor "failOnError", "failAfterError", "format", and "formatEach" to use "result" or "results" methods

v1.0.0

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• Bump eslint dependency to ^1.0.0
• Update dev-dependencies and js-doc formats

v0.15.0

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• Update dependencies
• Bump eslint dependency to ^0.24.0

v0.14.0

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• Bump eslint dependency to ^0.23.0
• Remove no-longer-needed code
• Fix project eslintrc syntax

v0.13.2

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• Remove dependency on through2 to address highWatermark overflow issue (#​36)

v0.13.1

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• Update dependencies

v0.13.0

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• Bump eslint dependency to ^0.22.1

v0.12.0

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• Bump eslint dependency to 0.21.x

v0.11.1

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• tidying-up dependencies

v0.11.0

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• Improve code coverage
• Remove support for deprecated/legacy formatters

v0.10.0

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• Bump eslint dependency to 0.20.x

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