Attempt to fix issue where animation isn't happening upon initial mount

demo/demo.jsx

@@ -12,7 +12,7 @@ const Config = ({ name, example, description, children }) => (
       <p><code>{name}</code><small className="text-muted m-l-1">{example ? `e.g. ${example}` : null}</small></p>
       <p>{description}</p>
       <div className="row">
-        <div className="col-xs-6 offset-xs-3">
+        <div className="col-xs-4 offset-xs-4">
           {children}
         </div>
       </div>
@@ -124,7 +124,12 @@ class Demo extends React.Component {
           name="initialAnimation"
           example="false"
           description="Toggle whether to animate progress starting from 0% on initial mount."
-        />
+        >
+          <CircularProgressbar
+            percentage={50}
+            initialAnimation={true}
+          />
+        </Config>
         <Config
           name="classForPercentage"
           example="(pct) => pct < 100 ? 'incomplete' : 'complete'"

src/index.jsx

@@ -12,10 +12,12 @@ class CircularProgressbar extends React.Component {
   componentDidMount() {
     if (this.props.initialAnimation) {
       setTimeout(() => {
-        this.setState({
-          percentage: this.props.percentage,
+        window.requestAnimationFrame(() => {
+          this.setState({
+            percentage: this.props.percentage,
+          });
         });
-      }, 10);
+      }, 0);
     }
   }