fix(package): update acorn to version 7.1.1

greenkeeper[bot] · web-flow · commit 7c415599482a · 2020-03-01T12:41:03.000Z
Closes #50
diff --git a/package.json b/package.json
@@ -17,7 +17,7 @@
     "LICENSE"
   ],
   "dependencies": {
-    "acorn": "^6.0.1",
+    "acorn": "^7.1.1",
     "acorn-walk": "^6.0.1"
   },
   "devDependencies": {
