Migrate to AndroidX framework

Change-Id: I55adcd7eb5c2713d9fd73b085ffc68e37e5e070f
diff --git a/build.gradle b/build.gradle
index 8c7755a..1ce4004 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@
         }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.1'
+        classpath 'com.android.tools.build:gradle:3.3.2'
         // classpath 'net.named-data.playground:play-publisher:1.2.0-2-SNAPSHOT'
         classpath 'com.github.triplet.gradle:play-publisher:1.2.0'