docs: use HTTPS when linking pages

Author: silvenon

src/CSSTransition.js

@@ -14,7 +14,7 @@ const removeClass = (node, classes) => node && classes && classes.split(' ').for
  * A transition component inspired by the excellent
  * [ng-animate](http://www.nganimate.org/) library, you should use it if you're
  * using CSS transitions or animations. It's built upon the
- * [`Transition`](http://reactcommunity.org/react-transition-group/transition)
+ * [`Transition`](https://reactcommunity.org/react-transition-group/transition)
  * component, so it inherits all of its props.
  *
  * `CSSTransition` applies a pair of class names during the `appear`, `enter`,

src/Transition.js

@@ -21,7 +21,7 @@ export const EXITING = 'exiting'
  *
  * **Note**: `Transition` is a platform-agnostic base component. If you're using
  * transitions in CSS, you'll probably want to use
- * [`CSSTransition`](http://reactcommunity.org/react-transition-group/css-transition)
+ * [`CSSTransition`](https://reactcommunity.org/react-transition-group/css-transition)
  * instead. It inherits all the features of `Transition`, but contains
  * additional features necessary to play nice with CSS transitions (hence the
  * name of the component).