fix(package): update pkg-up to version 2.0.0 (#168)

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
   "dependencies": {
     "find-babel-config": "^1.0.1",
     "glob": "^7.1.1",
-    "pkg-up": "^1.0.0",
+    "pkg-up": "^2.0.0",
     "resolve": "^1.3.2"
   },
   "devDependencies": {