Version 1.3

• 1 new program added
  1. animedoro #83
• two_step_timer function added
• print_message function added
• SECURITY.md added
• Test system modified
• nava added to requirements.txt
• Sound playing system updated
• Python 3.5 dropped
• short-break program duration changed from 10 minutes to 5 minutes
• long-break program duration changed from 30 minutes to 15 minutes
• pomodoro program updated
• pomodoro_timer function modified
• load_params function modified
• README.md updated
• _112_26_timer function removed
• _52_17_timer function removed