build: update version

Change-Id: I872ff808146cfcb0719cbfa47e5165ff495cf430
diff --git a/ring-android/app/build.gradle b/ring-android/app/build.gradle
index 147589f..944ac08 100644
--- a/ring-android/app/build.gradle
+++ b/ring-android/app/build.gradle
@@ -9,8 +9,8 @@
     defaultConfig {
         minSdkVersion 21
         targetSdkVersion 29
-        versionCode 230
-        versionName "2020408-01"
+        versionCode 231
+        versionName "20200413-01"
     }
     sourceSets {
         main {