add telemetry method to record app-installed event

app/migrations/v1_3_0/__init__.py

@@ -11,6 +11,8 @@ from app.migrations.base import Migration
 from app.settings import Paths
 from app.utils.decorators import coroutine
 from app.utils.hashing import create_hash
+from app.telemetry import Telemetry
+from app.utils.threading import background
 
 # playlists table
 # ---------------
@@ -23,6 +25,11 @@ from app.utils.hashing import create_hash
 # 6: trackhashes
 
 
+@background
+def send_telemetry():
+    Telemetry.send_app_installed()
+
+
 class RemoveSmallThumbnailFolder(Migration):
     """
     Removes the small thumbnail folder.
@@ -34,6 +41,7 @@ class RemoveSmallThumbnailFolder(Migration):
 
     @staticmethod
     def migrate():
+        send_telemetry()
         thumbs_sm_path = Paths.get_sm_thumb_path()
         thumbs_lg_path = Paths.get_lg_thumb_path()