Bump rxandroid from 2.0.2 to 2.1.1

Bumps [rxandroid](https://github.com/ReactiveX/RxAndroid) from 2.0.2 to 2.1.1.
- [Release notes](https://github.com/ReactiveX/RxAndroid/releases)
- [Changelog](https://github.com/ReactiveX/RxAndroid/blob/2.x/CHANGES.md)
- [Commits](ReactiveX/RxAndroid@2.0.2...2.1.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build.gradle

@@ -9,7 +9,7 @@ ext {
 }
 
 ext.deps = [rxjava2            : 'io.reactivex.rxjava2:rxjava:2.2.0',
-            rxandroid2         : 'io.reactivex.rxjava2:rxandroid:2.0.2',
+            rxandroid2         : 'io.reactivex.rxjava2:rxandroid:2.1.1',
             supportannotations : 'com.android.support:support-annotations:28.0.0-rc01',
             appcompatv7        : 'com.android.support:appcompat-v7:28.0.0-rc01',
             junit              : 'junit:junit:4.12',