5.4.7: added support for ancient vk videos & salt improvements

- now you can download 240p hardbass videos from 2008!
- implemented updated stream salt and ip salt properly

src/test/tests.json

@@ -475,6 +475,14 @@
             "code": 200,
             "status": "stream"
         }
+    }, {
+        "name": "ancient video (fallback to 240p)",
+        "url": "https://vk.com/video-1959_28496479",
+        "params": {},
+        "expected": {
+            "code": 200,
+            "status": "stream"
+        }
     }, {
         "name": "inexistent video",
         "url": "https://vk.com/video-53333333_456233333",