Update Rollup to 0.20.1

package.json

@@ -31,6 +31,6 @@
     "ractive": "^0.7.3",
     "ractive-events-tap": "^0.2.0",
     "ractive-transitions-slide": "^0.2.1",
-    "rollup": "^0.19.1"
+    "rollup": "^0.20.1"
   }
 }

src/app/main.js

@@ -74,6 +74,8 @@ if ( supported ) {
 		/*global rollup */
 		rollup.rollup({
 			entry: 'main',
+			plugins: [
+				{
 					resolveId ( importee, importer ) {
 						if ( !importer ) return importee;
 						if ( importee[0] !== '.' ) return false;
@@ -90,6 +92,8 @@ if ( supported ) {
 
 						return module.code;
 					}
+				}
+			]
 		}).then( bundle => {
 			output.set({
 				imports: bundle.imports,