Remove symbols from file name chars because it makes links look like …

…shit

main.go

@@ -97,7 +97,7 @@ func Zeros(path string, size int64) error {
 }
 
 func NameGen(fileNameLength int) string {
- const chars = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ0123456789-_"
+ const chars = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ0123456789"
  ll := len(chars)
  b := make([]byte, fileNameLength)
  rand.Read(b) // generates len(b) random bytes