message: fix eslint version
diff: "concurrently": "^4.1.0",
  "eslint": "~6.8.0",
  "eslint-plugin-eslint-comments": "~3.1.2",
  - "eslint-plugin-import": "~2.20.0",
  + "eslint-plugin-import": "2.20.0",
  "eslint-plugin-no-null": "~1.0.2",
  "eslint-plugin-optimize-regex": "~1.1.7",
  "eslint-plugin-prefer-arrow": "~1.1.7",
  