Going with the Flow

Switched to using Flow to type check all the code.
There shouldn't be any breaking changes, but there has been some internal bug fixes that was caught after enabling Flow.

v1.0.0

Added support for all the IntersectionObserver options! 🎉

This closes #18

v0.3.0

Removed the Intersection Observer polyfill - You need to add it manually to your project.

Fixes: #10

v0.2.13

Fix #8 - Merge usage of isIntersecting with intersectionRatio.

v0.2.12

Removed debugging console.log

v0.2.10

Fixes #7 by removing usage of isIntersecting