[pgp] 1.5.1

Fix Singleton import

pgp/backend/python_gnupg.py

@@ -26,7 +26,7 @@ from functools import lru_cache
 
 import gnupg
 
-from gajim.common.helpers import Singleton
+from gajim.common.util.classes import Singleton
 
 from pgp.exceptions import SignError
 

pgp/plugin-manifest.json

@@ -16,5 +16,5 @@
         "gajim>=1.4.0"
     ],
     "short_name": "pgp",
-    "version": "1.5.0"
+    "version": "1.5.1"
 }