Update swagger requirement from 0.7 to 4.0 in /vault-api

[dependabot-preview]

Updates the requirements on swagger to permit the latest version.

Changelog

Sourced from swagger's changelog.

[4.0.0] - 2020-02-20

Changed

• Use hyper-openssl on Linux, instead of hyper-tls
• Use a builder pattern to created client connectors
• Allow HTTPS connectors to be built which don't pin the server CA certificate
• Allow HTTPS to work on Mac/Windows/iOS
• Enforce that HTTPS is used if we are using a HTTPS connector.
• Return Results, rather than unwrapping errors on connector creation
• openssl 0.10

[3.2.0] - 2020-02-12

Added

• Added macro request_parser_joiner to easily create a composite RequestParser that will match a request against multiple RequestParsersa
• Add DropContextService as a client middleware too

Changed

• Make context macros self-contained
• Update swagger-rs to Rust 2018 Edition

[3.1.0] - 2019-05-07

Added

• Add swagger::client::MakeService trait

[3.0.0] - 2019-03-08

Changed

• Hyper 0.12 support.

  This creates large scale changes with corresponding renaming (e.g. NewService -> MakeService) and other fall out.

  Hyper Services don't have Request as a type parameters - instead the body of the request / response are type parameters.

  As such context for requests, such as authorization data is kept in a ContextualPayload struct, instead of a tuple.

Removed

• AddContext structs which we were previously deprecated are now removed.

[2.0.2] - 2018-12-13

Added

• Allow ContextWrapper to be cloned.

[2.0.1] - 2018-11-12

Changed

• Make compatible with clippy on stable (1.30.1)

[2.0.0] - 2018-09-28

Changed

• Added the AddContextNewService and AddContextService structs, and deprecated the old AddContext struct. One or other of the new structs should be a drop-in replacement for the AddContext, depending on whether it was being used as a NewService or Service.
• modified the new_context_type macro to only implement Push, Pop and Has for types explicitly passed to the macro. This is a breaking change, which should only require minor changes such as adding type annotations if the macro was used as recommended in the docs.

[1.0.2] - 2018-07-23

... (truncated)

Commits

• ebaa73a Release 4.0.0
• e93272a Merge #79
• 7b3d151 TLS review markups
• 148917b Improve TLS support
• b686adb Fix target annotation for pub use
• d795c4b Fix error handling for HTTPS connections
• b23b6d1 Merge branch 'master' into ssl-update
• db7ab7e Release 3.2.0
• 7a21dc4 Merge #99
• 1ce919f Re-instate accidentally removed test and fix follow-on issues
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #56.