Update dependency load-grunt-config to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
load-grunt-config	devDependencies	major	^0.19.2 -> ^3.0.0

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Release Notes

firstandthird/load-grunt-config

v3.0.1

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• Allowed relative path for JS loading

v3.0.0

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• Dropped support of node lower than 8
• Added yarn.lock
• Updated dependencies:
  • load-grunt-tasks from 4.0.0 to 5.1.0
  • lodash from 4.7.11 to 4.7.15
• Updated devDependencies

v2.0.1

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• Updated dependencies:
  • lodash from 4.7.11 to 4.7.15
• Updated devDependencies

v2.0.0

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• Dropped support of node lower than 6
• Added package-lock.json
• Updated dependencies:
  • js-yaml from ~3.12.0 to 3.13.1
  • cson from ~4.0.0 to 5.1.0
  • load-grunt-tasks from ~3.5.2 to 4.0.0
  • glob from ~7.1.3 to 7.1.4
• Switched to strict dependencies versions
• Updated devDependencies

v1.0.2

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• Updated dependencies:
  • glob from ~7.1.1 to ~7.1.3
  • js-yaml from ~3.7.0 to ~3.12.0

v1.0.1

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• Added ability to customize package.json file location

v1.0.0

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• Dropped support of node lower than 4
• Updated dependencies:
  • cson from ~3.0.2 to ~4.0.0
  • glob from ~5.0.15 to ~7.1.1
  • load-grunt-tasks from ~3.3.0 to ~3.5.2
  • js-yaml from ~3.4.3 to ~3.7.0
  • lodash from ~3.10.1 to ~4.17.11
• Updated devDependencies:
  • grunt-contrib-jshint from ~0.11.3 to ~1.1.0
  • grunt-contrib-watch from ~0.6.1 to ~1.1.0
  • grunt from ~0.4.5 to ~1.0.1
  • grunt-gh-pages from ~1.0.0 to ~3.1.0

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