chore: remove greenkeeper ignore for find-up (#768)

Author: realityking

package.json

@@ -156,10 +156,5 @@
     "test-exclude",
     "yargs",
     "yargs-parser"
-  ],
-  "greenkeeper": {
-    "ignore": [
-      "find-up"
-    ]
-  }
+  ]
 }