fix(package): update p-limit to version 2.2.0

Closes #15

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "cosmiconfig": "^4.0.0",
     "fs-extra": "^5.0.0",
     "find-cache-dir": "^1.0.0",
-    "p-limit": "^1.1.0",
+    "p-limit": "^2.2.0",
     "cacache": "^10.0.1",
     "serialize-javascript": "^1.4.0"
   },