refactor: update README.md documentation.

README.md

@@ -28,7 +28,7 @@ There currently are about **14349** unique aircraft in **51** categories found i
 These aircraft are divided into four main databases:
 
 -   [plane-alert-db.csv](plane-alert-db.csv) - A list of interesting aircraft with tags, categories and links. (14316)
--   [plane-alert-pia.csv](plane-alert-pia.csv): A list that contains PIA planes. (73)
+-   [plane-alert-pia.csv](plane-alert-pia.csv): A list that contains PIA planes. (80)
 -   [plane-alert-ukraine.csv](plane-alert-ukraine.csv): A list with Ukrainian planes. (33)
 -   [plane_images.csv](plane_images.csv): A accompanying list that contains aircraft images. (11334)