Add missing prop

Author: JamesMcIntosh

index.js

@@ -86,7 +86,8 @@ class SignaturePad extends Component {
                     this.props.useFont,
                     escapedName,
                     this.props.height,
-                    this.props.width
+                    this.props.width,
+                    this.props.initTimeout
                 );
             var html = htmlContent(injectedJavaScript, this.props.fontStyle);
             this.source = {html};