Add rxKotlin version 2.2.0

Author: Ebenezer Ackon

app/build.gradle

@@ -25,6 +25,13 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 
+
+    /**
+     Because RxAndroid releases are few and far between, it is recommended you also
+     explicitly depend on RxJava's latest version for bug fixes and new features.
+     */
+    implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
+    implementation 'io.reactivex.rxjava2:rxkotlin:2.2.0'
     // kotlin
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
 

etherscanapi/build.gradle

@@ -28,10 +28,10 @@ dependencies {
 
     /**
      Because RxAndroid releases are few and far between, it is recommended you also
-     explicitly depend on RxJava's latest version for bug fixes and new features.
+     explicitly depend on RxKotlin's latest version for bug fixes and new features.
      */
     implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
-    implementation 'io.reactivex.rxjava2:rxjava:2.1.9'
+    implementation 'io.reactivex.rxjava2:rxkotlin:2.2.0'
 
     // gson
     implementation 'com.google.code.gson:gson:2.8.2'