fix: package.json to reduce vulnerabilities (#3)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:ms:20170412

Latest report for node-modules/humanize-ms:
https://snyk.io/test/github/node-modules/humanize-ms

package.json

@@ -3,7 +3,9 @@
   "version": "1.2.0",
   "description": "transform humanize time to ms",
   "main": "index.js",
-  "files": ["index.js"],
+  "files": [
+    "index.js"
+  ],
   "scripts": {
     "test": "make test"
   },
@@ -22,7 +24,7 @@
   },
   "license": "MIT",
   "dependencies": {
-    "ms": "~0.7.0"
+    "ms": "~2.0.0"
   },
   "devDependencies": {
     "autod": "*",