Update dependency magic-string to v0.25.4 (#220)

Author: renovate-bot

package.json

@@ -36,7 +36,7 @@
     "acorn-dynamic-import": "4.0.0",
     "acorn-walk": "6.2.0",
     "google-closure-compiler": "20190909.0.0",
-    "magic-string": "0.25.3",
+    "magic-string": "0.25.4",
     "temp-write": "4.0.0"
   },
   "devDependencies": {