use apollo-upload-server 6.0.0-alpha.1

[andyrichardson]

It's not a perfect solution but moving to the latest alpha version should fix #1542.

The originating dependency issue can be found here.

/label dependencies

[apollo-cla]

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[evans]

@andyrichardson Thank you for the PR! I'd love to get this in, since the core-js dependency is quite annoying. Upgrading to the alpha of apollo-upload-server would necessitate removing support for Node 6 #1167, which would remove support for environments that require Node 6. If we dropped support, then we'd only be supporting a single lts version of Node, which isn't ideal. Forking apollo-upload-server and compiling to es5 could be another solution. Are there other possible fixes?

[andyrichardson]

Hey @evans, I've made a request for Node 6 support on the dependent package.

In the meantime, I think a 5.0.1 release of apollo-upload-server, with core-js added to the dependencies, makes the most sense.