Bump apollo-server from 2.7.0 to 2.7.1 in /backend

Created by: Tirokk

Authored by dependabot-preview[bot] Jul 26, 2019 Closed Jul 29, 2019

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Bumps apollo-server from 2.7.0 to 2.7.1.

Changelog

Sourced from apollo-server's changelog.

v2.7.1

See complete versioning details.

• apollo-engine-reporting: If an error is thrown by a custom variable transform function passed into the reporting option sendVariableValues: { transform: ... }, all variable values will be replaced with the string [PREDICATE_FUNCTION_ERROR].
• apollo-server-express: Typing fix for the connectionproperty, which was missing from theExpressContext` interface. [PR #2959](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2959)
• @apollo/gateway: Ensure execution of correct document within multi-operation documents by including the operationName in the cache key used when caching query plans used in federated execution. [PR #3084](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/3084)

Commits

• 2f87e4a Publish
• cdeb267 Update CHANGELOG.md prior to v2.7.1 release.
• 145cc50 Add CHANGELOG entry for #3084.
• 7660727 Merge pull request #3084 from apollographql/jackson/fix-operationName-bug
• 20d9a00 Fix precedence error
• 356af7d Fix causing operation name to sometimes be incorrectly done
• 3fb9208 Added: graphql-firestore-subscriptions (#2340)
• 585085d Stop pinning Lerna to pre v3.14.0.
• de9e3bf Avoid (more) dependency updates which mandate a major version bump.
• 198807c Avoid dependency updates which mandate a major version bump.
• Additional commits viewable in compare view

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