Update Yubico Authenticator to 2.2.0 (20199)

Also enable AUM now that there is a free flavor.

Closes fdroid/fdroiddata#1523.

metadata/com.yubico.yubioath.yml

@@ -130,7 +130,15 @@ Builds:
     gradle:
       - yes
 
-AutoUpdateMode: None
+  - versionName: 2.2.0
+    versionCode: 20199
+    commit: 2.2.0
+    subdir: app
+    gradle:
+      - strict
+    prebuild: sed -i -e '/com.google.android.gms/d' build.gradle
+
+AutoUpdateMode: Version %v
 UpdateCheckMode: Tags ^[0-9.]+$
 CurrentVersion: 2.2.0
 CurrentVersionCode: 20199