Bump to 3.1.6

- https://github.com/AfterShip/phone/pull/258/files Updated Nigeria phone number data

package.json

@@ -1,6 +1,6 @@
 {
   "name": "phone",
-  "version": "3.1.5",
+  "version": "3.1.6",
   "description": "With a given country and phone number, validate and format the phone number to E.164 standard",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",