This fixes the vibration feature for notification for Android notifications for API >= 26. This pattern is used for the Notif Builder for API < 26 and it appears to work there as well.

Before:

```
<Sending Notif>
2020-10-04 12:37:03.630 1936-29464/? E/VibratorService: vibratorOff command failed (1).
2020-10-04 12:37:03.935 1936-29476/? E/VibratorService: vibratorOff command failed (1).
```

After:
```
<Sending Notif>
2020-10-04 12:07:16.037 1936-4760/? E/VibratorService: vibratorOff command failed (1).
2020-10-04 12:07:16.037 1936-4760/? E/VibratorService: vibratorOn command failed (1).
2020-10-04 12:07:16.438 1936-1936/? E/VibratorService: vibratorOff command failed (1).
```

Have tested this on a physical device as well and it works. This could lead to an obvious extension which is for users to specify a vibration pattern array when creating a channel.

Author: Nesh Patel

android/src/main/java/com/dieam/reactnativepushnotification/modules/RNPushNotificationHelper.java

@@ -908,7 +908,7 @@ public boolean createChannel(ReadableMap channelInfo) {
         String soundName = channelInfo.hasKey("soundName") ? channelInfo.getString("soundName") : "default";
         int importance = channelInfo.hasKey("importance") ? channelInfo.getInt("importance") : 4;
         boolean vibrate = channelInfo.hasKey("vibrate") && channelInfo.getBoolean("vibrate");
-        long[] vibratePattern = vibrate ? new long[] { DEFAULT_VIBRATION } : null;
+        long[] vibratePattern = vibrate ? new long[] { 0, DEFAULT_VIBRATION } : null;
 
         NotificationManager manager = notificationManager();