v0.6

Major changes:

• The delay between the writing of each word in word_by_word method is changed from 0.05s to 0.15s by default.
• The text passed to the char_by_char and word_by_word methods is now split so that it does not exceed dialog boxes
  not exit the dialog box (see example).
• Added the possibility to pass curses attributes to texts in the methods.
  char_by_char, word_by_word and in the dialog title (see this example).
• The title of the dialog box is now bold by default.
• Added an example file (text_attributes.py).
• Complete rewrite of the code documentation.

Minor changes:

• Optimized the getkey method.
• Addition and improvement of comments in the source code.
• Reformatting the source code and examples (by yapf).
• Improvement of the examples.