Update dependency eslint-plugin-node to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
eslint-plugin-node	dependencies	major	^7.0.1 -> ^8.0.0	source

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Release Notes

mysticatea/eslint-plugin-node

v8.0.0

Compare Source

This release focuses on supporting new things that were added between Node.js 8.7.0 and 11.0.0.

Breaking changes

• 5860795 updated node/no-deprecated-api rule to disallow new deprecated APIs.
  Especially, it includes legacy URL API.
• d153b93 updated node/no-unsupported-features/node-builtins rule to detect new APIs.

New rules

• 46ed54d added node/prefer-global/text-decoder rule for new global varaible TextDecoder.
• 46ed54d added node/prefer-global/text-encoder rule for new global varaible TextEncoder.

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[codecov]

Codecov Report

Merging #24 into develop will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           develop    #24   +/-   ##
======================================
  Coverage      100%   100%           
======================================
  Files            1      1           
  Lines            1      1           
======================================
  Hits             1      1

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