Bump apollo-server from 2.6.4 to 2.6.6 in /backend

Created by: Tirokk

Authored by dependabot-preview[bot] Jun 26, 2019 Merged Jun 26, 2019

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Bumps apollo-server from 2.6.4 to 2.6.6.

Changelog

Sourced from apollo-server's changelog.

v2.6.6

• apollo-server-core: Avoid duplicate cacheControl directives being added via isDirectiveDefined, re-landing the implementation reverted in v2.6.1 which first surfaced in v2.6.0. [PR #2762](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2762) [Reversion PR #2754](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2754) [Original PR #2428](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2428)
• apollo-server-testing: Add TypeScript types for apollo-server-testing client. [PR #2871](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2871)
• apollo-server-plugin-response-cache: Fix undefined property access attempt which occurred when an incomplete operation was received. [PR #2792](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2792) [Issue #2745](https://github-redirect.dependabot.com/apollographql/apollo-server/issues/2745)

v2.6.5

• apollo-engine-reporting: Simplify the technique for capturing operationName. [PR #2899](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2899)
• apollo-server-core: Fix regression in 2.6.0 which caused engine: false not to disable Engine when the ENGINE_API_KEY environment variable was set. [PR #2850](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2850)
• @apollo/federation: Introduced a README.md. [PR #2883](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2883)
• @apollo/gateway: Introduced a README.md. [PR #2883](https://github-redirect.dependabot.com/apollographql/apollo-server/pull/2883)

Commits

• 26db63c Publish
• e5310b3 Update CHANGELOG.md in preparation for v2.6.6.
• 0939b27 expose TypeScript types for apollo-server-testing client (#2871)
• 35cd9a1 Fix getting started link (#2902)
• 0ae49d3 Fix isGraphQLQuery check in response-cache plugin (#2792)
• d767397 Update CONTRIBUTING.md to forewarn about the CLA requirement.
• 65ca915 Avoid duplicate cacheControl directives via `isDirectiveDefin… (#2762)
• a2b2a0d Publish
• 0569079 Update CHANGELOG.md in preparation for release.
• a8832c8 Bump version of apollo-cache-control which is already tagged as released.
• Additional commits viewable in compare view

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