Tweak 'legacy' option in rollup config (#5929)

build/rollup-config.js

@@ -30,9 +30,9 @@ export default {
 		format: 'umd',
 		name: 'L',
 		banner: banner,
-		sourcemap: true,
+		sourcemap: true
-		legacy: true // Needed to create files loadable by IE8
 	},
+	legacy: true, // Needed to create files loadable by IE8
 	plugins: [
 		release ? json() : rollupGitVersion()
 	]

build/rollup-watch-config.js

@@ -20,9 +20,9 @@ export default {
 		format: 'umd',
 		name: 'L',
 		banner: banner,
-		sourcemap: true,
+		sourcemap: true
-		legacy: true // Needed to create files loadable by IE8
 	},
+	legacy: true, // Needed to create files loadable by IE8
 	plugins: [
 		rollupGitVersion()
 	]

package.json

@@ -20,7 +20,7 @@
     "mocha": "^3.1.0",
     "phantomjs-prebuilt": "^2.1.12",
     "prosthetic-hand": "^1.3.1",
-    "rollup": "^0.49.2",
+    "rollup": "^0.51.8",
     "rollup-plugin-git-version": "0.2.1",
     "rollup-plugin-json": "^2.1.0",
     "rollup-watch": "^4.3.1",