Bump ecto_sql from 3.1.4 to 3.1.6

[dependabot-preview[bot]]

Bumps ecto_sql from 3.1.4 to 3.1.6.

Changelog

*Sourced from [ecto_sql's changelog](https://github.com/elixir-ecto/ecto_sql/blob/master/CHANGELOG.md).* > ## v3.1.6 (2019-06-27) > > ### Enhancements > > * [sql] Set `cache_statement` for `insert_all > > ## v3.1.5 (2019-06-13) > > ### Enhancements > > * [migration] Add `@disable_migration_lock` to be better handle concurrent indexes > * [mysql] Set `cache_statement` for inserts > > ### Deprecations > > * [mysql] Deprecate Ecto.Adapters.MySQL

Commits

- [`3eedfb0`](https://github.com/elixir-ecto/ecto_sql/commit/3eedfb0f21340834689af5dfef439018d171c067) Release v3.1.6 - [`4f82126`](https://github.com/elixir-ecto/ecto_sql/commit/4f8212632d2873540e6c4faa8387d3795de9d2ba) Set cache_statement on insert_all ([#121](https://github-redirect.dependabot.com/elixir-ecto/ecto_sql/issues/121)) - [`d2ce99d`](https://github.com/elixir-ecto/ecto_sql/commit/d2ce99dd6e792c092528a619c17d7092a3d44736) Release v3.1.5 - [`529f333`](https://github.com/elixir-ecto/ecto_sql/commit/529f333d32ec361c7455cedfb992f3ec6d5f407e) Deprecate Ecto.Adapters.MySQL ([#116](https://github-redirect.dependabot.com/elixir-ecto/ecto_sql/issues/116)) - [`d40cd16`](https://github.com/elixir-ecto/ecto_sql/commit/d40cd16c8453117d6d876fac07b40970a58516cc) Bump myxql - [`01912a6`](https://github.com/elixir-ecto/ecto_sql/commit/01912a6569a4331de43ce1730f0aa5dd723fd5e5) Use more describe in migration tests - [`a80f80e`](https://github.com/elixir-ecto/ecto_sql/commit/a80f80ef9a46d6ca95dae5c26878bd3369135d11) Add [@​disable_migration_lock](https://github.com/disable_migration_lock), closes [#115](https://github-redirect.dependabot.com/elixir-ecto/ecto_sql/issues/115) - [`dbbd5d4`](https://github.com/elixir-ecto/ecto_sql/commit/dbbd5d422e0e3fe1c76874d82e6ad406332a9098) Use old db_connection on lock for now - [`3466b72`](https://github.com/elixir-ecto/ecto_sql/commit/3466b72a33e56d5c3f97d8eed61088b1326ca0e9) Support upcoming Postgrex - [`2b4ac61`](https://github.com/elixir-ecto/ecto_sql/commit/2b4ac614121a06aefeb8f55d94e8a2a697e8b0e4) Set cache_statement for myxql inserts - See full diff in [compare view](https://github.com/elixir-ecto/ecto_sql/compare/v3.1.4...v3.1.6)

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[dependabot-preview[bot]]

Looks like ecto_sql is up-to-date now, so this is no longer needed.