add latest highlightjs explicitly as a dependency

Author: b-kelly

package-lock.json

@@ -41,6 +41,7 @@
     "grunt-contrib-watch": "^1.1.0",
     "grunt-shell": "^3.0.1",
     "grunt-ts": "^6.0.0-beta.22",
+    "highlight.js": "^10.3.2",
     "typescript": "^4.0.3"
   },
   "browserslist": [