Bump npm-run-all from 4.1.3 to 4.1.5 (#510)

Bumps [npm-run-all](https://github.com/mysticatea/npm-run-all) from 4.1.3 to 4.1.5.
- [Release notes](https://github.com/mysticatea/npm-run-all/releases)
- [Commits](mysticatea/npm-run-all@v4.1.3...v4.1.5)

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

Author: dependabot[bot]

package-lock.json

@@ -43,7 +43,7 @@
     "moment": "^2.22.2",
     "node-sass-chokidar": "^1.3.4",
     "normalize.css": "^8.0.0",
-    "npm-run-all": "^4.1.3",
+    "npm-run-all": "^4.1.5",
     "pixi-filters": "^2.6.1",
     "pixi.js": "^4.8.0",
     "query-string": "^6.1.0",