This release patches the media-query prefers-reduced-motion according to the new specs and avoid some unexpected problems. Fixes #932 #934 #928.

• Modify animation speed/duration with fast, faster, slow, slower class names
• Modify delay with delay-1s, delay-2s, delay-3s class names
• Added support for reduced-motion media queries to disable animations for users who prefer reduced motion
• An added animation: heartBeat
• Documentation and dev dependencies have been updated
• Updated to Gulp 4