error alert

• add error alert if picture's hosting is down
• optimization

fixes

• fix card's animation during first rendering

fixes && features

• fix the game result for an alert
• add animated counter and game field when the time goes to over

random card's pictures

• Max density from 2 to 8.
• There are no static images. Every new game will render new random images.

First (old) alpha version

2018 years old version.
Based on React 16.0v.
Developed by class components and redux-thunk.