Bump apollo-boost from 0.4.4 to 0.4.7 (#134)

Bumps [apollo-boost](https://github.com/apollographql/apollo-client) from 0.4.4 to 0.4.7.
- [Release notes](https://github.com/apollographql/apollo-client/releases)
- [Changelog](https://github.com/apollographql/apollo-client/blob/master/CHANGELOG.md)
- [Commits](https://github.com/apollographql/apollo-client/compare/apollo-boost@0.4.4...apollo-boost@0.4.7)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>