feat(hugo): upgrade Hugo to v0.31 (#35)

* feat(hugo): upgrade Hugo to v0.31

* Update README.md

README.md

@@ -46,6 +46,7 @@ See the [Hugo Documentation](https://gohugo.io/) for more information.
 
 |  hugo-bin version | Hugo version |
 |:-----------------:|:------------:|
+|       ^0.18.0     |     v0.31    |
 |       ^0.17.0     |     v0.30.2  |
 |       ^0.16.0     |     v0.29    |
 |       ^0.15.0     |     v0.28    |

package.json

@@ -1,7 +1,7 @@
 {
   "name": "hugo-bin",
   "version": "0.17.0",
-  "hugoVersion": "0.30.2",
+  "hugoVersion": "0.31",
   "description": "Binary wrapper for Hugo",
   "repository": "fenneclab/hugo-bin",
   "author": "satoshun00 <shun.sato@fenneclab.com>",