Usage:
   ruby src/main.rb [-h] [-b/-a] [-o output_file] [-o output_folder] [-w] [-s separator] [-d]
   -h, --help           Show this help.
   -b, --by_song        Records one song lyrics per file.
                        [Enable by default]
   -a, --all_songs      Writes all the lyrics to a single file.
   -o, --output_file    Name of the output file
                        [Works with -a / --allsongs only]
   -f, --output_folder  Name of the output folder
                        ['output' by default]
   -w, --with_title     The name of the song is included in the file.
                        [Disabled by default]
   -s, --separator      Defines how song lyrics are separated.
                        [Works with -a / --allsongs only]
   -u, --url            URL to parse.
                        Works with site http://slushat-tekst-pesni.ru/ only!
                        Also, you can change the artist to another one and get
                        the lyrics of his songs
                        Be careful, changing to another site will
                        most likely lead to a breakdown of the application
   -d, --debug          Displays messages about the progress of the program.
                        [Disabled by default]