deps: Allow npm-package-arg@5

Author: iarna

package.json

@@ -18,7 +18,7 @@
     "concat-stream": "^1.5.2",
     "graceful-fs": "^4.1.6",
     "normalize-package-data": "~1.0.1 || ^2.0.0",
-    "npm-package-arg": "^3.0.0 || ^4.0.0",
+    "npm-package-arg": "^3.0.0 || ^4.0.0 || ^5.0.0",
     "once": "^1.3.3",
     "request": "^2.74.0",
     "retry": "^0.10.0",