Update dependency load-grunt-config to v2 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
load-grunt-config	devDependencies	major	^1.0.0 -> ^2.0.0

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Release Notes

firstandthird/load-grunt-config

### [`v2.0.0`](https://togithub.com/firstandthird/load-grunt-config/blob/master/CHANGELOG.md#​200--2019-06-20) [Compare Source](https://togithub.com/firstandthird/load-grunt-config/compare/1.0.2...2.0.0) ================== - 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

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