update rollup and fix test regression

Author: Kelly Selden

package-lock.json

@@ -7,7 +7,7 @@
     "es5-ext": "^0.10.39",
     "eslint": "^4.18.0",
     "mocha": "^5.0.1",
-    "rollup": "^0.54.1",
+    "rollup": "^0.55.5",
     "rollup-plugin-buble": "^0.19.2",
     "rollup-plugin-commonjs": "^8.3.0",
     "string-capitalize": "^1.0.1",

package.json

@@ -14,9 +14,9 @@ function executeBundle ( bundle ) {
 	}).then( generated => {
 		const fn = new Function ( 'module', 'exports', 'assert', generated.code );
 		const module = { exports: {} };
-	
+
 		fn( module, module.exports, assert );
-	
+
 		return module;
 	});
 }
@@ -356,7 +356,7 @@ describe( 'rollup-plugin-node-resolve', function () {
 				})
 			]
 		}).then( bundle => {
-			assert.deepEqual( bundle.imports.sort(), [ 'events' ] );
+			assert.equal( bundle.modules.length, 1 );
 		});
 	});
 
@@ -369,7 +369,7 @@ describe( 'rollup-plugin-node-resolve', function () {
 				})
 			]
 		}).then( bundle => {
-			assert.deepEqual( bundle.imports.sort(), [] );
+			assert.equal( bundle.modules.length, 2 );
 		});
 	});