make printout warning

Author: h-mayorquin

neo/rawio/plexon2rawio/plexon2rawio.py

@@ -120,7 +120,7 @@ def __init__(self, filename, pl2_dll_file_path=None):
                 dist = urlopen(url=url)
 
                 with open(pl2_dll_file_path, "wb") as f:
-                    print(f"Downloading plexon dll to {pl2_dll_file_path}")
+                    warnings.warn(f"dll file does not exist, downloading plexon dll to {pl2_dll_file_path}")
                     f.write(dist.read())
 
         # Instantiate wrapper for Windows DLL