chore(deps): Bump querystringify from 0.0.4 to 2.1.1

[dependabot[bot]]

Bumps querystringify from 0.0.4 to 2.1.1.

Commits

• 88d2336 [dist] 2.1.1
• 30e1d19 [fix] Don't throw on invalid input (#25)
• e619535 [fix] Correctly transform null/undefined/NaN values to an empty string #22
• 020c30f [dist] 2.0.0
• 422eb4f [security] Prevent overriding of build-in properties by default (#19)
• 0b65759 chore(package): update mocha to version 3.5.0 (#12)
• 5e79e6e chore(package): update mocha to version 3.4.0 (#11)
• 4cad3ab chore(package): update mocha to version 3.3.0 (#10)
• 1e41231 Merge pull request #9 from unshiftio/greenkeeper/assume-1.5.0
• 7cdb42e chore(package): update assume to version 1.5.0
• Additional commits viewable in compare view

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