fix(deps): update dependency swagger-fluent to v5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
swagger-fluent	dependencies	major	^4.0.0 -> ^5.0.0

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Release Notes

silasbw/swagger-fluent

### [`v5.0.0`](https://togithub.com/silasbw/swagger-fluent/blob/master/CHANGELOG.md#​500-httpsgithubcomsilasbwswagger-fluentcompare400500-2020-04-08) [Compare Source](https://togithub.com/silasbw/swagger-fluent/compare/4.0.0...5.0.0) ##### ⚠ BREAKING CHANGES - to avoid pulling in `request`. ##### Bug Fixes - double slash in fetch backend path construction ([#​53](https://togithub.com/silasbw/swagger-fluent/issues/53)) ([33373af](https://togithub.com/silasbw/swagger-fluent/commit/33373af)) - don't use default backend, to avoid unnecessary deps ([#​54](https://togithub.com/silasbw/swagger-fluent/issues/54)) ([c4e7cf4](https://togithub.com/silasbw/swagger-fluent/commit/c4e7cf4))

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