chore: update bulid.gradle
chore: update bulid.gradle

kaushikgopal/RxJava-Android-Samples,marukami/RxJava-Android-Samples,jmfayard/RxJava-Android-Samples,TonyTangAndroid/RxJava-Android-Samples,TonyTangAndroid/RxJava-Android-Samples,alanwgeorge/Android-RxJava,kaushikgopal/Android-RxJava,kaushikgopal/RxJava-Android-Samples