Use export syntax supported by Webpack v4 (Fixes #228)

browser/index.js

@@ -1,2 +1,5 @@
-export * as default from './dist/index.js'
+// `export * as default from ...` fails on Webpack v4
+// https://github.com/eemeli/yaml/issues/228
+import * as YAML from './dist/index.js'
+export default YAML
 export * from './dist/index.js'

package.json

@@ -18,9 +18,9 @@
   "type": "commonjs",
   "main": "./dist/index.js",
   "browser": {
-    "./index.js": "./browser/index.js",
-    "./util.js": "./browser/dist/util.js",
-    "./util.mjs": "./browser/dist/util.js"
+    "./dist/index.js": "./browser/index.js",
+    "./dist/util.js": "./browser/dist/util.js",
+    "./util.js": "./browser/dist/util.js"
   },
   "exports": {
     ".": {