Bump com.squareup.retrofit2.version from 2.3.0 to 2.8.0

[dependabot-preview]

Bumps com.squareup.retrofit2.version from 2.3.0 to 2.8.0.
Updates retrofit from 2.3.0 to 2.8.0

Changelog

Sourced from retrofit's changelog.

Version 2.8.0 (2020-03-23)

• New: Add Call.timeout() which returns the okio.Timeout of the full call.
• Fix: Change Call.awaitResponse() to accept a nullable response type.
• Fix: Support default methods on Java 14+. We had been working around a bug in earlier versions of Java. That bug was fixed in Java 14, and the fix broke our workaround.

Version 2.7.2 (2020-02-24)

• Fix: Update to OkHttp 3.14.7 for compatibility with Android R (API 30).

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.

... (truncated)

Commits

• 2cde2ae [maven-release-plugin] prepare release parent-2.8.0
• 955dde3 Add link to okhttp & okio proguard rules
• bfb5cd3 Merge pull request #3340 from square/zachklipp/awaitresponse-allownulls
• 9106005 Allow awaitResponse() to be called with nullable type parameter.
• 3adf79a Merge pull request #3313 from igomezal/docs/updateAnnotations
• 206c860 Merge pull request #3338 from square/jwilson.0318.call_timeout
• e905980 Add Call.timeout() which returns the OkHttp Timeout
• ff448cf Merge pull request #3334 from square/cogman/master
• a0700b8 Add Java 14+ support for default methods
• 32c7ff4 Merge pull request #3331 from square/jakew/dedupe/2020-03-11
• Additional commits viewable in compare view

Updates converter-jackson from 2.3.0 to 2.8.0

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Superseded by #12.