upgrade to Realm 2.2.2

app/src/main/java/info/nightscout/android/UploaderApplication.java

@@ -41,7 +41,8 @@ public class UploaderApplication extends Application {
             Bugfender.setDeviceString("NightscoutURL", prefs.getString(getString(R.string.preference_nightscout_url), "Not set"));
         }
 
-        RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this)
+        Realm.init(this);
+        RealmConfiguration realmConfiguration = new RealmConfiguration.Builder()
                 .deleteRealmIfMigrationNeeded()
                 .build();