chore(dependencies): upgrade acorn to 5.7.4

Signed-off-by: Trung Nguyen <trung.nguyen@docker.com>

package-lock.json

@@ -94,9 +94,9 @@
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
     },
     "acorn": {
-      "version": "5.7.3",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
-      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw=="
+      "version": "5.7.4",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
+      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg=="
     },
     "acorn-globals": {
       "version": "4.3.0",

package.json

@@ -65,6 +65,7 @@
   },
   "devDependencies": {
     "@types/react": "16.0.38",
+    "acorn": "^5.7.4",
     "babel-cli": "^6.26.0",
     "babel-jest": "^23.6.0",
     "babel-plugin-transform-async-to-generator": "^6.24.1",