chore(deps): update devdependency eslint to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
eslint (source)	devDependencies	major	^5.16.0 -> ^6.0.1

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Release Notes

eslint/eslint

v6.0.1

Compare Source

• b5bde06 Fix: --rulesdir option didn't work (fixes #​11888) (#​11890) (Toru Nagashima)
• 13f0418 Fix: improve error message on --print-config (fixes #​11874) (#​11885) (Toru Nagashima)
• 056c2aa Fix: improve diagnostics for shareable-config-missing errors (#​11880) (Teddy Katz)
• 566b7aa Docs: Update no-confusing-arrow with the new default option (#​11886) (Yuping Zuo)
• d07f3fa Fix: CLIEngine#getRules() contains plugin rules (fixes #​11871) (#​11872) (Toru Nagashima)
• 21f4a80 Docs: Fix inconsistent linking in migration guide (#​11881) (Teddy Katz)
• f3a0774 Docs: Fix typo in 6.0.0 migration guide (#​11870) (Kevin Partington)

v6.0.0

Compare Source

• 81aa06b Upgrade: espree@6.0.0 (#​11869) (Teddy Katz)
• 5f022bc Fix: no-else-return autofix produces name collisions (fixes #​11069) (#​11867) (Milos Djermanovic)
• ded9548 Fix: multiline-comment-style incorrect message (#​11864) (golopot)
• cad074d Docs: Add JSHint W047 compat to no-floating-decimal (#​11861) (Timo Tijhof)
• 41f6304 Upgrade: sinon (#​11855) (Toru Nagashima)
• 167ce87 Chore: remove unuseable profile command (#​11854) (Toru Nagashima)
• c844c6f Fix: max-len properly ignore trailing comments (fixes #​11838) (#​11841) (ZYSzys)
• 1b5661a Fix: no-var should not fix variables named 'let' (fixes #​11830) (#​11832) (Milos Djermanovic)
• 4d75956 Build: CI with Azure Pipelines (#​11845) (Toru Nagashima)
• 1db3462 Chore: rm superfluous argument & fix perf-multifiles-targets (#​11834) (薛定谔的猫)
• c57a4a4 Upgrade: @​babel/polyfill => core-js v3 (#​11833) (薛定谔的猫)
• 65faa04 Docs: Clarify prefer-destructuring array/object difference (fixes #​9970) (#​11851) (Oliver Sieweke)
• 81c3823 Fix: require-atomic-updates reports parameters (fixes #​11723) (#​11774) (Toru Nagashima)
• aef8ea1 Sponsors: Sync README with website (ESLint Jenkins)

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[pimlie]

Ref: vuejs/eslint-plugin-vue#910

[codecov-io]

Codecov Report

Merging #5968 into dev will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #5968      +/-   ##
==========================================
+ Coverage   95.68%   95.72%   +0.03%     
==========================================
  Files          82       82              
  Lines        2689     2689              
  Branches      690      690              
==========================================
+ Hits         2573     2574       +1     
+ Misses         98       97       -1     
  Partials       18       18

Flag	Coverage Δ
#e2e	100% <ø> (ø)	⬆️
#fixtures	50.35% <ø> (ø)	⬆️
#unit	92.71% <ø> (+0.03%)	⬆️

Impacted Files	Coverage Δ
packages/vue-renderer/src/renderer.js	94.3% <0%> (+0.81%)	⬆️

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[clarkdo]

NOTE: eslint v6 requires Node.js to be "^8.10.0 || ^10.13.0 || >=11.10.1", but it should be fine since it's a devDependency