Update README.md

[drensin]

fixup function declarations. endpoints.Context doesn't exist, but context.Context does.

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[drensin]

signed!

On Sun, Aug 21, 2016 at 12:21 AM googlebot notifications@github.com wrote:

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[s-mang]

Hey thanks for the PR! Just merged this change via a different PR: https://github.com/GoogleCloudPlatform/go-endpoints/pull/124

Cheers :D