update Acorn

package-lock.json

@@ -61,9 +61,9 @@
       "dev": true
     },
     "acorn": {
-      "version": "6.0.5",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.5.tgz",
-      "integrity": "sha512-i33Zgp3XWtmZBMNvCr4azvOFeWVw1Rk6p3hfi3LUDvIFraOMywb1kAtrbi+med14m4Xfpqm3zRZMT+c0FNE7kg==",
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.1.tgz",
+      "integrity": "sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA==",
       "dev": true
     },
     "acorn-dynamic-import": {

package.json

@@ -51,7 +51,7 @@
   "devDependencies": {
     "@types/mocha": "^5.2.0",
     "@types/node": "^10.5.5",
-    "acorn": "^6.0.5",
+    "acorn": "^6.1.1",
     "acorn-dynamic-import": "^4.0.0",
     "agadoo": "^1.0.1",
     "c8": "^3.4.0",