Add proxy support

[kbrandwijk]

The apollo-link that is created should support a proxy, based on process.env.HTTP_PROXY and process.env.HTTPS_PROXY. Will create a PR for this later.

[gaving]

I'd be interested in any updates to this, currently just getting a network error in corporate land (though it's good that the CLI supports a proxy now as per 1.7):-

[Network error]: FetchError: request to https://eu1.prisma.sh/gavin-gilmour-9cd7a4/prisma-test/dev failed, reason: getaddrinfo ENOTFOUND eu1.prisma.sh eu1.prisma.sh:443
Error: request to https://eu1.prisma.sh/gavin-gilmour-9cd7a4/prisma-test/dev failed, reason: getaddrinfo ENOTFOUND eu1.prisma.sh eu1.prisma.sh:443
at new CombinedError (C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\stitching\errors.js:83:28)
at Object.checkResultAndHandleErrors (C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\stitching\errors.js:101:15)
at CheckResultAndHandleErrors.transformResult (C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\transforms\CheckResultAndHandleErrors.js:10:25)
at C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\transforms\transforms.js:19:54
at Array.reduce ()
at applyResultTransforms (C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\transforms\transforms.js:18:23)
at C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\stitching\delegateToSchema.js:82:50
at step (C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\stitching\delegateToSchema.js:32:23)
at Object.next (C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\stitching\delegateToSchema.js:13:53)
at fulfilled (C:\gavin\projects\burn\server\node_modules\graphql-tools\dist\stitching\delegateToSchema.js:4:58)

[maticzav]

@kbrandwijk is this still relevant?