Bump npm from 6.0.0 to 6.7.0

Bumps [npm](https://github.com/npm/cli) from 6.0.0 to 6.7.0.
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/latest/CHANGELOG.md)
- [Commits](https://github.com/npm/cli/compare/v6.0.0...v6.7.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -3,6 +3,6 @@
     "start": "hugo server -s exampleSite"
   },
   "dependencies": {
-    "npm": "^6.0.0"
+    "npm": "^6.7.0"
   }
 }