Bump libraryVersion.retrofit2 from 2.4.0 to 2.7.1

[dependabot-preview]

Bumps libraryVersion.retrofit2 from 2.4.0 to 2.7.1.
Updates retrofit from 2.4.0 to 2.7.1

Changelog

Sourced from retrofit's changelog.

Version 2.7.1 (2020-01-02)

• Fix: Support 'suspend' functions in services interfaces when using 'retrofit-mock' artifact.

Version 2.7.0 (2019-12-09)

This release changes the minimum requirements to Java 8+ or Android 5+. See this blog post for more information on the change.

• New: Upgrade to OkHttp 3.14.4. Please see its changelog for 3.x.
• Fix: Allow service interfaces to extend other interfaces.
• Fix: Ensure a non-null body is returned by Response.error.

Version 2.6.4 (2020-01-02)

• Fix: Support 'suspend' functions in services interfaces when using 'retrofit-mock' artifact.

Version 2.6.3 (2019-12-09)

• Fix: Change mechanism for avoiding UndeclaredThrowableException in rare cases from using yield an explicit dispatch which ensures that it will work even on dispatchers which do not support yielding.

Version 2.6.2 (2019-09-23)

• Fix: Avoid IOExceptions being wrapped in UndeclaredThrowableException in rare cases when using Response<..> as a return type for Kotlin 'suspend' functions.

Version 2.6.1 (2019-07-31)

• Fix: Avoid IOExceptions being wrapped in UndeclaredThrowableException in rare cases.
• Fix: Include no-content ResponseBody for responses created by Response.error.
• Fix: Update embedded R8/ProGuard rules to not warn about nested classes used for Kotlin extensions.

Version 2.6.0 (2019-06-05)

• New: Support suspend modifier on functions for Kotlin! This allows you to express the asynchrony of HTTP requests in an idiomatic fashion for the language.

... (truncated)

Commits

• 7110c19 [maven-release-plugin] prepare release parent-2.7.1
• 7da4ea0 Prepare version 2.7.1
• 53a8877 Add coroutine support to BehaviorDelegate
• 121108e Prepare next development version
• e04e88d [maven-release-plugin] prepare release parent-2.7.0
• 20ef67c Add SCM API dependency
• bfedd12 Prepare version 2.7.0
• e3a1c46 Merge branch 'two-six'
• 62ab32f Prepare next development version
• 4401b6d Prepare version 2.6.3
• Additional commits viewable in compare view

Updates adapter-rxjava2 from 2.4.0 to 2.7.1

Updates converter-gson from 2.4.0 to 2.7.1

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[dependabot-preview]

Superseded by #71.