fix(build): adjust build script, add umd es2015, fix unpkg field

Author: bigopon

package.json

@@ -17,7 +17,7 @@
   "main": "dist/commonjs/aurelia-fetch-client.js",
   "module": "dist/es2015/aurelia-fetch-client.js",
   "browser": "dist/umd/aurelia-fetch-client.js",
-  "unpkg": "dist/umd/aurelia-fetch-client.js",
+  "unpkg": "dist/umd-es2015/aurelia-fetch-client.js",
   "typings": "dist/aurelia-fetch-client.d.ts",
   "repository": {
     "type": "git",

rollup.config.js

@@ -9,7 +9,7 @@ export default [
         format: 'esm'
       },
       {
-        file: 'dist/umd/aurelia-fetch-client.js',
+        file: 'dist/umd-es2015/aurelia-fetch-client.js',
         format: 'umd',
         name: 'au.fetchClient',
         globals: {
@@ -57,6 +57,18 @@ export default [
       { file: 'dist/commonjs/aurelia-fetch-client.js', format: 'cjs' },
       { file: 'dist/system/aurelia-fetch-client.js', format: 'system' },
       { file: 'dist/native-modules/aurelia-fetch-client.js', format: 'esm' },
+      {
+        file: 'dist/umd/aurelia-fetch-client.js',
+        format: 'umd',
+        name: 'au.fetchClient',
+        globals: {
+          'aurelia-binding': 'au',
+          'aurelia-dependency-injection': 'au',
+          'aurelia-pal': 'au',
+          'aurelia-templating': 'au',
+          'aurelia-templating-resources': 'au',
+        }
+      },
     ],
     plugins: [
       typescript({