Bump rxjava from 3.1.5 to 3.1.6 (#83)

Bumps [rxjava](https://github.com/ReactiveX/RxJava) from 3.1.5 to 3.1.6.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Commits](ReactiveX/RxJava@v3.1.5...v3.1.6)

---
updated-dependencies:
- dependency-name: io.reactivex.rxjava3:rxjava
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -50,7 +50,7 @@ repositories {
 
 dependencies {
     implementation "io.reactivex.rxjava2:rxjava:2.2.21"
-    implementation "io.reactivex.rxjava3:rxjava:3.1.5"
+    implementation "io.reactivex.rxjava3:rxjava:3.1.6"
     testImplementation 'junit:junit:4.13.2'
 }