build: update version

Change-Id: Ie90a8c62d99c0fa93a0f99fcfb5009c6e9ad250a
diff --git a/ring-android/app/build.gradle b/ring-android/app/build.gradle
index 383ae30..e7da60d 100644
--- a/ring-android/app/build.gradle
+++ b/ring-android/app/build.gradle
@@ -8,8 +8,8 @@
     defaultConfig {
         minSdkVersion 21
         targetSdkVersion 29
-        versionCode 205
-        versionName "20191208-01"
+        versionCode 206
+        versionName "20191217-01"
     }
     sourceSets {
         main {