Bump rxjava from 3.0.2 to 3.0.3 (#54)

Bumps [rxjava](https://github.com/ReactiveX/RxJava) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Commits](ReactiveX/RxJava@v3.0.2...v3.0.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

build.gradle

@@ -48,7 +48,7 @@ dependencies {
 
     compile "org.reactivestreams:reactive-streams:1.0.3"
     compile "io.reactivex:rxjava:1.3.8"
-    compile "io.reactivex.rxjava3:rxjava:3.0.2"
+    compile "io.reactivex.rxjava3:rxjava:3.0.3"
 
     testCompile group: 'junit', name: 'junit', version: '4.13'
     testCompile 'org.mockito:mockito-core:3.3.3'