Bump gettext from 0.16.1 to 0.17.1

[dependabot-preview[bot]]

Bumps gettext from 0.16.1 to 0.17.1.

Changelog

*Sourced from [gettext's changelog](https://github.com/elixir-gettext/gettext/blob/master/CHANGELOG.md).* > ## v0.17.1 > > * Store the `msgctxt` value in translation and dump it when dumping translations > * Fix a bug when dumping references > * Improve code generation > * Preserve whitespace in translation flags > > ## v0.17.0 > > * Require Elixir 1.6 and later > * Add stats reporting when merging PO files

Commits

- [`faf2f7a`](https://github.com/elixir-gettext/gettext/commit/faf2f7aa8eef6fb68e9f43d270865d48a2832859) Release v0.17.1 - [`65a871c`](https://github.com/elixir-gettext/gettext/commit/65a871c92f0a7c2b4c4fde0a6c50e5b5ca9834c0) Remove an outdated comment in parser ([#223](https://github-redirect.dependabot.com/elixir-lang/gettext/issues/223)) - [`4075840`](https://github.com/elixir-gettext/gettext/commit/40758400d9aed747668c1cb21bdc7541177052eb) Simplify Gettext.Fuzzy.translation_key/0 type spec ([#224](https://github-redirect.dependabot.com/elixir-lang/gettext/issues/224)) - [`9cd91cf`](https://github.com/elixir-gettext/gettext/commit/9cd91cf9faf0017d2b53d671e4564e33be327b47) Remove an outdated comment in parser - [`9041038`](https://github.com/elixir-gettext/gettext/commit/90410386c12a605ce1108bfd75703d6cb25dbad5) Fix PO parser to support one-letter references ([#221](https://github-redirect.dependabot.com/elixir-lang/gettext/issues/221)) - [`ec480f6`](https://github.com/elixir-gettext/gettext/commit/ec480f6e3d60bccf22e7fa5f0e0fa1d515449002) Preserve whitespaces in flags ([#218](https://github-redirect.dependabot.com/elixir-lang/gettext/issues/218)) - [`2a30bdd`](https://github.com/elixir-gettext/gettext/commit/2a30bdd9227fca601b3d9f7d0f15a31de75e4783) Replace backticks with quotes in the PO info comment ([#220](https://github-redirect.dependabot.com/elixir-lang/gettext/issues/220)) - [`6ece04c`](https://github.com/elixir-gettext/gettext/commit/6ece04cbfd23a6042ee3963bf27391765ae7559a) Simplify regex that is used when parsing references ([#219](https://github-redirect.dependabot.com/elixir-lang/gettext/issues/219)) - [`14fb260`](https://github.com/elixir-gettext/gettext/commit/14fb260455bf1accebcfd9e2cd08dff1e807ba77) Fix warning in tests ([#217](https://github-redirect.dependabot.com/elixir-lang/gettext/issues/217)) - [`65abef1`](https://github.com/elixir-gettext/gettext/commit/65abef19fddb45b4581ad44b384e05dc05443f48) Optimize Gettext.get_locale/0,1 by explicitly matching on pdict return ([#216](https://github-redirect.dependabot.com/elixir-lang/gettext/issues/216)) - Additional commits viewable in [compare view](https://github.com/elixir-lang/gettext/compare/v0.16.1...v0.17.1)

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[dependabot-preview[bot]]

Superseded by #75.