fix: package.json to reduce vulnerabilities (swagger-api#4224)

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

Latest report for heldersepu/swagger-ui:
https://snyk.io/test/github/heldersepu/swagger-ui

package.json

@@ -53,7 +53,7 @@
     "ieee754": "^1.1.8",
     "immutable": "^3.x.x",
     "js-yaml": "^3.5.5",
-    "lodash": "4.17.2",
+    "lodash": "4.17.5",
     "matcher": "^0.1.2",
     "memoizee": "0.4.1",
     "promise-worker": "^1.1.1",