fix npm install error by upgrading package natural

Author: gph-sn

package.json

@@ -54,7 +54,7 @@
     "lodash": "^4.17.4",
     "marked": "^0.3.9",
     "ms": "^2.0.0",
-    "natural": "^0.5.6",
+    "natural": "^0.6.0",
     "node-unzip-2": "^0.2.7",
     "ora": "^2.0.0",
     "os-homedir": "^1.0.1",