Update dependencies.

package-lock.json

@@ -3776,7 +3776,8 @@
       "dependencies": {
         "acorn": {
           "version": "5.7.3",
-          "resolved": "",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
+          "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
           "dev": true
         },
         "acorn-jsx": {