Bump adapter-rxjava2 from 2.8.1 to 2.9.0

[dependabot-preview]

Bumps adapter-rxjava2 from 2.8.1 to 2.9.0.

Changelog

Sourced from adapter-rxjava2's changelog.

Version 2.9.0 (2020-05-20)

• New: RxJava 3 adapter!

  The Maven coordinates are com.squareup.retrofit2:adapter-rxjava3.

  Unlike the RxJava 1 and RxJava 2 adapters, the RxJava 3 adapter's create() method will produce asynchronous HTTP requests by default. For synchronous requests use createSynchronous() and for synchronous on a scheduler use createWithScheduler(..).

Version 2.8.2 (2020-05-18)

• Fix: Detect running on the Android platform by using system property rather than the presence of classes. This ensures that even when you're running on the JVM with Android classes present on the classpath you get JVM semantics.
• Fix: Update to OkHttp 3.14.9 which contains an associated Android platform detection fix.

Commits

• bd33a5d Prepare version 2.9.0
• 762f590 Add releasing steps
• 8796695 Merge pull request #3374 from ctlove0523/master
• 467764b Update Maven references to Gradle
• ab1d46d Merge pull request #3315 from mickverm/rxjava3-adapter
• f68ceb4 Added RxJava3 adapter
• 1078fd1 Prepare next development version
• 16205e9 Add pom descriptions for each deployed artifact
• 9710e64 Prepare version 2.8.2
• 8e38431 Merge pull request #3394 from square/jw/okhttp/2020-05-17
• Additional commits viewable in compare view

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.

[jraska]

This PR was released with 0.22.1