Filename contains forbidden characters on Windows

[Hai]

Date: Oct 31, 2018
Image title: R Leporis: A Vampire's Star
Image link: https://apod.nasa.gov/apod/image/1811/RLeporisMP1024.jpg

Current bug:
On windows, the above file results in a file name having colon, which is then truncated by Windows, leaving us an empty R-Leporis file.

Solution:
Remove special characters from file name: <>":/|?*