Bump phoenix from 1.4.8 to 1.4.9

[dependabot-preview[bot]]

Bumps phoenix from 1.4.8 to 1.4.9.

Changelog

*Sourced from [phoenix's changelog](https://github.com/phoenixframework/phoenix/blob/v1.4.9/CHANGELOG.md).* > ## 1.4.9 (2019-07-03) > > ### Enhancements > * [local.phx] Use hex for fetching the latest `phx_new` package > * [phx.new] Use Ecto v3.1 and MyXQL for new apps > > ### Bug Fixes > * [Endpoint] Fix bug causing headers to be dropped for cowboy adapters on WebSocket upgrade > * [ConnTest] Fix issue causing loss of connection information when using `bypass_through`

Commits

- [`900dc7f`](https://github.com/phoenixframework/phoenix/commit/900dc7f79616327a14d82c6ce7146dcae489e8a0) Release 1.4.9 - [`f07a551`](https://github.com/phoenixframework/phoenix/commit/f07a551113269d26c693a78979016e9037c9046b) Copy request headers on ws upgrade - [`5691dc5`](https://github.com/phoenixframework/phoenix/commit/5691dc54e0e1991177da09ae94191face751b6cc) Update version on local.phx note - [`1f94456`](https://github.com/phoenixframework/phoenix/commit/1f944564dad2d6ad0cff52bed9306cb6a514005a) Use hex in mix local.phx ([#3452](https://github-redirect.dependabot.com/phoenixframework/phoenix/issues/3452)) - [`21959ba`](https://github.com/phoenixframework/phoenix/commit/21959ba13ba88b46e92ed9053a505b482fa7e82b) Release fixes - [`118c4bd`](https://github.com/phoenixframework/phoenix/commit/118c4bdfbd96f311da0e9ef58195bdb401414781) Add a guide on v1.9 releases - [`3da1bd4`](https://github.com/phoenixframework/phoenix/commit/3da1bd4901726761a368b831cae0661ade4933f2) Try to add more hints about when things go together - [`78a3815`](https://github.com/phoenixframework/phoenix/commit/78a38153740be6150eaaacd6b2214a6eb4bbc9dd) Return prepared connection on bypass_through, closes [#3442](https://github-redirect.dependabot.com/phoenixframework/phoenix/issues/3442) - [`16d6811`](https://github.com/phoenixframework/phoenix/commit/16d6811fe32c90ce77bf7cd29f49869ba15a130b) Use String.trim instead of deprecated API, closes [#3437](https://github-redirect.dependabot.com/phoenixframework/phoenix/issues/3437) - [`56ec3f9`](https://github.com/phoenixframework/phoenix/commit/56ec3f923fd2d0028ae9a9e06b266a5651204789) Use Ecto v3.1 and MyXQL for new apps - See full diff in [compare view](https://github.com/phoenixframework/phoenix/compare/v1.4.8...v1.4.9)

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[dependabot-preview[bot]]

Superseded by #48.