`Evision.Zoo.TextRecognition.CRNN.init/2` failing to download charset

[Wígny Almeida]

Since opencv/opencv_zoo#123 removed the charset files from the text_recognition_crnn folder, the charset_info/1 function is returning the URL for non-existing files.

[Cocoa]

Hi @Wigny, thanks for reporting this issue! Since they embedded charsets into the source file, I might do that as well. I'll push a new commit soon!