Bump mongodb from 3.1.6 to 3.1.7

[dependabot-preview[bot]]

Bumps mongodb from 3.1.6 to 3.1.7.

Changelog

*Sourced from [mongodb's changelog](https://github.com/mongodb/node-mongodb-native/blob/master/HISTORY.md).* > ## [3.1.7](https://github.com/mongodb/node-mongodb-native/compare/v3.1.6...v3.1.7) (2018-10-09) > > > ### Features > > * **core:** update mongodb-core to v3.1.6 ([61b054e](https://github.com/mongodb/node-mongodb-native/commit/61b054e)) > > > >

Commits

- [`94fd6d8`](https://github.com/mongodb/node-mongodb-native/commit/94fd6d8858938764423dd4921f86191b53117eda) chore(release): 3.1.7 - [`61b054e`](https://github.com/mongodb/node-mongodb-native/commit/61b054e1a4a09c3cb1feefaa7641aee1828ac668) feat(core): update mongodb-core to v3.1.6 - [`64c2d3f`](https://github.com/mongodb/node-mongodb-native/commit/64c2d3f602ee4918e3a326ecd6fd4bcb745ac0f3) docs(promises): Doc what promises resolve to. - [`7418401`](https://github.com/mongodb/node-mongodb-native/commit/741840165bafb0b15984719453bf455c0fc370d5) Fixed deprecation warning. - [`da4df89`](https://github.com/mongodb/node-mongodb-native/commit/da4df8941a06522571470a8f5448d0a86e49abc6) test(eval): removes group command tests that use eval - [`c612117`](https://github.com/mongodb/node-mongodb-native/commit/c6121174e6d924150e7ac526c9ea9a81d234bc9b) test(eval): removes all eval tests - [`09f58e7`](https://github.com/mongodb/node-mongodb-native/commit/09f58e7beebcf0172b8552cd0f09ece7efcf8636) docs(transactions): fixing transaction examples - [`90caf42`](https://github.com/mongodb/node-mongodb-native/commit/90caf4295e6de9976ff729809cb87ca8b2da03ce) chore(package-lock): updating package-lock.json - [`50602ce`](https://github.com/mongodb/node-mongodb-native/commit/50602cedee7595db1d973c9b3667fdfcd3e1bb10) test(GridFS): fixes bug in node 10.10.x - See full diff in [compare view](https://github.com/mongodb/node-mongodb-native/compare/v3.1.6...v3.1.7)

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[dependabot-preview[bot]]

Superseded by #84.