Add missing semi-colon

Author: mraxus

lib/react-diff.js

@@ -41,7 +41,7 @@ module.exports = React.createClass({
     var result = diff.map(function(part, index) {
       var spanStyle = {
         backgroundColor: part.added ? 'lightgreen' : part.removed ? 'salmon' : 'lightgrey'
-      }
+      };
       return <span key={index} style={spanStyle}>{part.value}</span>
     });
     return (