fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade: - https://snyk.io/vuln/npm:lodash:20180130 - https://snyk.io/vuln/npm:slug:20170907

Author: snyk-bot

package.json

@@ -76,7 +76,7 @@
  "i18next-express-middleware": "1.3.2",
  "i18next-node-fs-backend": "2.0.0",
  "ioredis": "4.0.0",
- "le_node": "1.7.1",
+ "le_node": "1.8.0",
  "lodash": "4.17.10",
  "method-override": "3.0.0",
  "mkdirp": "0.5.1",
@@ -102,7 +102,7 @@
  "pretty-bytes": "5.1.0",
  "require-webpack-compat": "3.0.0",
  "serve-favicon": "2.5.0",
- "slug": "0.9.1",
+ "slug": "0.9.2",
  "snyk": "1.94.0",
  "socket.io": "2.1.1",
  "socket.io-client": "2.1.1",