Added update notification channel

app/src/main/java/eu/faircode/email/ActivityView.java

@@ -737,7 +737,7 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
                 }
 
                 NotificationCompat.Builder builder =
-                        new NotificationCompat.Builder(ActivityView.this, "notification")
+                        new NotificationCompat.Builder(ActivityView.this, "update")
                                 .setSmallIcon(R.drawable.baseline_system_update_24)
                                 .setContentTitle(getString(R.string.title_updated, info.tag_name))
                                 .setAutoCancel(true)

app/src/main/java/eu/faircode/email/ApplicationEx.java

@@ -310,6 +310,14 @@ public class ApplicationEx extends Application {
             notification.enableLights(true);
             nm.createNotificationChannel(notification);
 
+            if (!Helper.isPlayStoreInstall(this)) {
+                NotificationChannel update = new NotificationChannel(
+                        "update", getString(R.string.channel_update),
+                        NotificationManager.IMPORTANCE_HIGH);
+                update.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
+                nm.createNotificationChannel(update);
+            }
+
             NotificationChannel warning = new NotificationChannel(
                     "warning", getString(R.string.channel_warning),
                     NotificationManager.IMPORTANCE_HIGH);

app/src/main/res/values/strings.xml

@@ -12,6 +12,7 @@
     <string name="channel_service">Service</string>
     <string name="channel_send">Send</string>
     <string name="channel_notification">Notifications</string>
+    <string name="channel_update">Updates</string>
     <string name="channel_warning">Warnings</string>
     <string name="channel_error">Errors</string>
     <string name="channel_group_contacts">Contacts</string>