[react-transition-group] Support appearDone class name on <CSSTransition/>

Since v2.9.0, the `appearDone` class name has been supported.

See also:
- https://github.com/reactjs/react-transition-group/blob/v2.9.0/CHANGELOG.md
- https://github.com/reactjs/react-transition-group/commit/fe3c156c11b140b4ce494261a2cc4ac66e99f40c

types/react-transition-group/CSSTransition.d.ts

@@ -5,6 +5,7 @@ declare namespace CSSTransition {
     interface CSSTransitionClassNames {
         appear?: string;
         appearActive?: string;
+        appearDone?: string;
         enter?: string;
         enterActive?: string;
         enterDone?: string;

types/react-transition-group/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for react-transition-group 2.8
+// Type definitions for react-transition-group 2.9
 // Project: https://github.com/reactjs/react-transition-group
 // Definitions by: Karol Janyst <https://github.com/LKay>
 //                 Epskampie <https://github.com/Epskampie>

types/react-transition-group/react-transition-group-tests.tsx

@@ -110,6 +110,7 @@ const Test: React.StatelessComponent = () => {
                 classNames={ {
                     appear: "fade-appear",
                     appearActive: "fade-active-appear",
+                    appearDone: "fade-done-appear",
                     enter: "fade-enter",
                     enterActive: "fade-active-enter",
                     enterDone: "fade-done-enter",