Update graphql-server-express to the latest version 🚀

[greenkeeper[bot]]

Version 0.5.2 of graphql-server-express just got published.

Dependency	graphql-server-express
Current Version	0.4.4
Type	dependency

The version 0.5.2 is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of graphql-server-express. Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

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Not sure how things should work exactly?

There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html) and of course you may always [ask my humans](https://github.com/greenkeeperio/greenkeeper/issues/new).

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Your Greenkeeper Bot :palm_tree:

[coveralls]

Coverage remained the same at 94.054% when pulling 2439143a0d41927c6d928d7f658196f79ac8db74 on greenkeeper/graphql-server-express-0.5.2 into 5600ef67e1f50cc3bba7d187405ffb0ed31c9b86 on master.

[coveralls]

Coverage remained the same at 94.054% when pulling 45f3431fa24eb1744da0a8b738d65ef4adbde6bf on greenkeeper/graphql-server-express-0.5.2 into f6da4f85a7490c4157b0b18845dd4321cd5d22d3 on master.