Bump npm from 5.10.0 to 6.14.6

Bumps [npm](https://github.com/npm/cli) from 5.10.0 to 6.14.6.
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/latest/CHANGELOG.md)
- [Commits](npm/cli@v5.10.0...v6.14.6)

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

package.json

@@ -22,7 +22,7 @@
     "install": "^0.10.4",
     "ip": "^1.1.5",
     "msgpack-lite": "^0.1.26",
-    "npm": "^5.7.1",
+    "npm": "^6.14.6",
     "nyc": "^11.4.1"
   },
   "devDependencies": {