记一个简单的Rxcache的栗子

1 相关依赖：

    compile "com.github.VictorAlbertos.RxCache:runtime:1.8.3-2.x"
    compile "io.reactivex.rxjava2:rxjava:2.1.6"
    implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
    compile 'com.github.VictorAlbertos.Jolyglot:gson:0.0.3'    compile "com.github.Victor