Fix version issue with build script

Change-Id: Idc70f8cb4e0b2895d439b35e085ce61b42e2ffc6
diff --git a/build.gradle b/build.gradle
index 3f69f62..b61a985 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,11 +7,14 @@
         maven {
             url "https://oss.sonatype.org/content/repositories/snapshots/"
         }
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.4.0'
         // classpath 'net.named-data.playground:play-publisher:1.2.0-2-SNAPSHOT'
-        classpath 'com.github.triplet.gradle:play-publisher:2.3.0-SNAPSHOT'
+        classpath 'com.github.triplet.gradle:play-publisher:2.2.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files