Bump rocket_codegen from 0.3.16 to 0.4.0

[dependabot-preview]

Bumps rocket_codegen from 0.3.16 to 0.4.0.

Release notes

Sourced from rocket_codegen's releases.

Rocket v0.4.0

See the CHANGELOG and news article for more information.

Rocket v0.4-rc.2

See the CHANGELOG and news article for more information.

Rocket v0.4-rc.1

See the CHANGELOG and news article for more information.

Rocket v0.3.17

See the CHANGELOG for more information.

Changelog

Sourced from rocket_codegen's changelog.

Version 0.4.0 (Dec 06, 2018)

New Features

This release includes the following new features:

• Introduced Typed URIs.
• Introduced ORM agnostic database support.
• Introduced [Request-Local State].
• Introduced mountable static-file serving via [StaticFiles].
• Introduced automatic [live template reloading].
• Introduced custom stateful handlers via [Handler].
• Introduced [transforming] data guards via [FromData::transform()].
• Introduced revamped [query string handling].
• Introduced the SpaceHelmet security and privacy headers fairing.
• Private cookies are gated behind a private-cookies default feature.
• Added [derive for FromFormValue].
• Added [derive for Responder].
• Added Template::custom() for customizing templating engines including
  registering filters and helpers.
• Cookies are automatically tracked and propagated by [Client].
• Private cookies can be added to local requests with
  LocalRequest::private_cookie().
• Release builds default to the production environment.
• Keep-alive can be configured via the keep_alive configuration parameter.
• Allow CLI colors and emoji to be disabled with ROCKET_CLI_COLORS=off.
• Route format accepts [shorthands] such as json and html.
• Implemented [Responder for Status].
• Added [Response::cookies()] for retrieving response cookies.
• All logging is disabled when log is set to off.
• Added [Metadata] guard for retrieving templating information.
• The [Uri] type parses URIs according to RFC 7230 into one of [Origin],
  [Absolute], or [Authority].
• Added [Outcome::and_then()], [Outcome::failure_then()], and
  [Outcome::forward_then()].
• Implemented Responder for &[u8].
• Any T: Into<Vec<Route>> can be [mount()]ed.
• [Default rankings] range from -6 to -1, differentiating on static query
  strings.
• Added [Request::get_query_value()] for retrieving a query value by key.
• Applications can launch without a working directory.
• Added State::from() for constructing State values.

... (truncated)

Commits

• a4dcb0c New version: 0.4.0.
• 7fb6ba9 Generate 'FromUriParam' impls in 'UriDisplayPath'.
• d7933dd Implement ignorable 'uri!' expressions.
• 50a635e Add support for MongoDB connection pooling in 'rocket_contrib'.
• 90a6749 New version: 0.4.0-rc.2.
• b405b18 Test 'rocket_contrib' before publishing.
• 7919cea Strip dev-dependencies more reliably.
• 5ec21d5 Update dependencies to published versions.
• ac82386 Systematically name and span codegen variables.
• b7db741 Parameterize 'UriDisplay' with 'Path' or 'Query'.
• Additional commits viewable in compare view

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