Bump apollo-client from 2.6.3 to 2.6.4 in /backend

Created by: Tirokk

Authored by dependabot-preview[bot] Aug 12, 2019 Merged Aug 12, 2019

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Bumps apollo-client from 2.6.3 to 2.6.4.

Changelog

Sourced from apollo-client's changelog.

Apollo Client (2.6.4)

Apollo Client (2.6.4)

• Modify ObservableQuery to allow queries with notifyOnNetworkStatusChange to be notified when loading after an error occurs.
  @​jasonpaulos in #4992
• Documentation updates. @​raibima in #5132
  @​hwillson in #5141

Commits

• d28dea2 chore: Publish
• a12d0f0 Changelog update; prep for publish
• c44e821 Make ObservableQuery.lastResult keep track of errors (#4992)
• c2139b9 chore(deps): update dependency gatsby to v2.13.57
• 0d6fc36 Merge pull request #5152 from danilobrinu/patch-1
• 4cc557f Update react-hooks.mdx
• e498011 Add StephenBarlow as codeowner for docs (#5149)
• 8cd905e chore(deps): update dependency gatsby-theme-apollo-docs to v1.2.3
• a35680b Merge pull request #5141 from apollographql/ra-issue-3321
• d4d81a3 Changelog update
• Additional commits viewable in compare view

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