build(deps): bump acorn from 6.3.0 to 6.4.1 (#173)

Bumps [acorn](https://github.com/acornjs/acorn) from 6.3.0 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/6.3.0...6.4.1)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package-lock.json

@@ -5279,6 +5279,12 @@
         "negotiator": "0.6.2"
       }
     },
+    "acorn": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
+      "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
+      "dev": true
+    },
     "acorn-globals": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.3.4.tgz",
@@ -5290,9 +5296,9 @@
       },
       "dependencies": {
         "acorn": {
-          "version": "6.3.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.3.0.tgz",
-          "integrity": "sha512-/czfa8BwS88b9gWQVhc8eknunSA2DoJpJyTQkhheIf5E48u1N0R4q/YxxsAeqRrmK9TQ/uYfgLDfZo91UlANIA==",
+          "version": "6.4.1",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+          "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
           "dev": true
         }
       }
@@ -9392,12 +9398,6 @@
         "eslint-visitor-keys": "^1.1.0"
       },
       "dependencies": {
-        "acorn": {
-          "version": "7.1.1",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
-          "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
-          "dev": true
-        },
         "eslint-visitor-keys": {
           "version": "1.1.0",
           "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.1.0.tgz",
@@ -15753,12 +15753,6 @@
         "xml-name-validator": "^3.0.0"
       },
       "dependencies": {
-        "acorn": {
-          "version": "7.1.1",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
-          "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
-          "dev": true
-        },
         "cssom": {
           "version": "0.4.4",
           "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.4.4.tgz",