Bump npm from 6.1.0 to 6.14.6

Bumps [npm](https://github.com/npm/cli) from 6.1.0 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@v6.1.0...v6.14.6)

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

package.json

@@ -33,7 +33,7 @@
     "lodash": "^4.17.10",
     "merkle-tree-gen": "^1.1.0",
     "moment": "^2.22.2",
-    "npm": "^6.1.0",
+    "npm": "^6.14.6",
     "seedrandom": "^2.4.3",
     "three": "^0.93.0",
     "three-orbit-controls": "^82.1.0",