Add instructions print statement to transfer.py.

transfer.py

@@ -30,6 +30,7 @@ if 'TRINKEY' in name:
     urllib.request.urlretrieve(
         "https://downloads.circuitpython.org/bin/adafruit_proxlight_trinkey_m0/en_US/adafruit-circuitpython-adafruit_proxlight_trinkey_m0-en_US-9.1.4.uf2", os.path.join(
             disk, 'trinkey.uf2'))
+    print("The drive will now eject. You can quit any keyboard popups that appear. Run the transfer.py file again for it to be bootable.")
 else:
     shutil.rmtree(os.path.join(disk, 'lib'), True)
     shutil.rmtree(os.path.join(disk, 'src'), True)