Revert "Moved from external 'notify-send' command to using notify2 library"

This reverts commit 6ccb04632b.

mail-notifier.py

@@ -18,13 +18,11 @@ from PyQt5 import QtCore, QtGui, QtWidgets
 import os
 import socket
 import time
-import notify2
 from datetime import datetime, date, time
 
 #variables
 programTitle = "Mail Notifier"
-programVersion = "3.01-dev"
-notify2.init(programTitle)
+programVersion = "3.01"
 settings = QSettings(os.path.expanduser("~")+"/.config/mail-notifier/settings.conf", QSettings.NativeFormat)
 def GlobalSettingsExist():
     if ((settings.contains("CheckInterval") and settings.value("CheckInterval") != "") and
@@ -441,8 +439,7 @@ def mail_check():
     window.lastCheckCount = mail_count
 def notify(message):
     if settings.value("Notify"):
-        n = notify2.Notification(programTitle, message)
-        n.show()
+        subprocess.Popen(['notify-send', programTitle, message])
     return