Merged in PhotonQyv/mastodon_etalab/Notification_Light (pull request #84)

Slowed the notification light down.

app/src/main/java/fr/gouv/etalab/mastodon/helper/Helper.java

@@ -604,7 +604,7 @@ public class Helper {
                 Could as angryTux suggested add some sort of option for user to choose the colour,
                 but not really sure that wouldn't just add another extra setting for no real reason.
              */
-            notificationBuilder.setLights(Color.BLUE, 250, 500);
+            notificationBuilder.setLights(Color.BLUE, 500, 1000);
         }else {
             String soundUri = ContentResolver.SCHEME_ANDROID_RESOURCE + "://" + context.getPackageName() +"/";