Update dependency magic-string to v0.25.1 (#61)

Author: renovate-bot

package-lock.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "acorn": "5.7.3",
     "google-closure-compiler": "20180805.0.0",
-    "magic-string": "0.25.0",
+    "magic-string": "0.25.1",
     "temp-write": "3.4.0"
   },
   "devDependencies": {