Update @types/rdf-js to the latest version 🚀

[greenkeeper[bot]]

The devDependency @types/rdf-js was updated from 1.0.1 to 2.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[coveralls]

Pull Request Test Coverage Report for Build 36

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.478%

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Totals
Change from base Build 31:	0.0%
Covered Lines:	462
Relevant Lines:	567

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💛 - Coveralls

[rubensworks]

@wschella This is a pretty big change in the RDFJS typings. This will likely require more changes than simply merging this PR. I suggest to put this on hold until I've applied the changes in comunica.

[greenkeeper[bot]]

• The devDependency @types/rdf-js was updated from 1.0.1 to 2.0.1.

Update to this version instead 🚀