Update SPM manifest example in README

GraphQLSwift / GraphQL

The Swift GraphQL implementation for macOS and Linux

MIT License

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Update SPM manifest example in README #40

Closed 5t111111 closed 6 years ago

5t111111 commented 6 years ago

I have updated the SPM manifest example in README. I think it is reasonable because GraphQL package itself is already compatible with Swift 4 and swift-tools-version 4.0.