Added more chars to the replace list (#8)

Some chars that are illegal for windows file names were allowed, this should replace them all with underscores.

Author: rareromfish

src/download.rs

@@ -170,6 +170,12 @@ impl<'a> Downloader<'a> {
                         || c == '\\'
                         || c == ':'
                         || c == '='
+                        || c == '?'
+                        || c == '"'
+                        || c == '<'
+                        || c == '>'
+                        || c == '|'
+                        || c == '*'
                     {
                         '_'
                     } else {