Update httpmock requirement from 0.5 to 0.6

[dependabot]

Updates the requirements on httpmock to permit the latest version.

Release notes

Sourced from httpmock's releases.

v0.6.1

This is a maintenance release that updates all dependencies to the most recent version.

Changelog

Sourced from httpmock's changelog.

Version 0.6.1

• This is a maintenance release that updates all dependencies to the most recent version.

Version 0.6.0

General

• Old Mock structure based API was deprecated starting from version 0.5.0 and was removed with this version. Please switch to the new API based on the When / Then structures.
• The two methods MockRef::times_called and MockRef::times_called_async were deprecated since version 0.5.0 and have now been removed.
• A prelude module was added to shorten imports that are usually required when using httpmock in tests.
• The struct MockRef has been renamed to Mock.
• Trait MockRefExt has been renamed to MockExt.
• Added support for x-www-form-urlencoded request bodies.

Standalone Mock Server

• Standalone server now has a request history limit that can be adjusted.
• All standalone servers parameters now have an environment variable fallback.
• Standalone servers exposed and disable_access_log parameters were changed, so that they now require a value in addition to the flag itself (this is due to a limitation of structopt/clap): Before: httpmock --expose, Now: httpmock --expose true.

Version 0.5.8

• A bug has been fixed that prevented to use the mock server for requests containing a multipart/form-data request body with binary data.

Version 0.5.7

• Added static mock support based on YAML files for standalone mode.
• Dockerfile Rust version has been fixed.
• Documentation on query parameters has been enhanced.
• Bumped minimum Rust version to 1.46 due to transitive dependency.

Version 0.5.6

• A bug has been fixed that caused false positive warnings in the log output.
• Updated all dependencies to the most recent versions.
• Assertion error messages (MockRef::assert and MockRef::assert_hits) now contain more details.

Version 0.5.5

• A bug has been fixed that prevented to use a request body in DELETE requests.

Version 0.5.4

• A new extension trait MockRefExt was added that extends the MockRef structure with additional but usually not required functionality.

Version 0.5.3

• This is a maintenance release that updates all dependencies to the most recent version.
• This release bumps the minimal Rust version from 1.43+ to 1.45+.

... (truncated)

Commits

• 8d828f8 (cargo-release) start next development iteration 0.6.2-alpha.0
• 729483a Raised version.
• 4de898f Updated dependencies.
• a174420 Updated dependencies.
• ea0ac4c Lowered body size sent in test for testability.
• e8c6ebe Updated version number.
• 4af980f (cargo-release) start next development iteration 0.6.1-alpha.0
• 6ae58dc Merge pull request #43 from alexliesenfeld/develop
• b01ec32 Fixed typo
• ac541a5 Test fixes
• Additional commits viewable in compare view

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