update gulp-umd

Author: stuyam

package-lock.json

@@ -16,7 +16,7 @@
     "gulp-inject-string": "^1.1.1",
     "gulp-rename": "^2.0.0",
     "gulp-uglify": "^3.0.1",
-    "gulp-umd": "^0.2.1",
+    "gulp-umd": "^2.0.0",
     "gulp-util": "^3.0.8",
     "natives": "^1.1.6",
     "path": "^0.12.7"