fix(package): update kind-of to version 5.1.0

Closes #42

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "is-error": "2.2.1",
     "is-promise": "2.1.0",
-    "kind-of": "3.2.0",
+    "kind-of": "5.1.0",
     "spread-args": "0.2.0"
   },
   "devDependencies": {