chore(deps): update dependency license-checker to v18.0.0 (#54)

Author: renovate[bot]

package.json

@@ -86,7 +86,7 @@
     "deps-ok": "1.2.4",
     "git-issues": "1.3.1",
     "github-post-release": "1.13.1",
-    "license-checker": "16.0.0",
+    "license-checker": "18.0.0",
     "mocha": "5.0.5",
     "nsp": "3.2.1",
     "pre-git": "3.17.1",