Update machinetag.json

Added Stalkerware, ad defined by Kaspersky "commercially available software that can be discreetly installed on smartphone devices, enabling a perpetrator to monitor an individual’s private life without their knowledge"

malware_classification/machinetag.json

@@ -52,6 +52,10 @@
           "value": "Adware",
           "expanded": "Adware"
         },
+        {
+          "value": "Stalkerware",
+          "expanded": "Stalkerware"
+        },
         {
           "value": "Spyware",
           "expanded": "Spyware"