Update NPM packages.

Author: dschnelldavis

package-lock.json

@@ -33,9 +33,9 @@
   },
   "devDependencies": {
     "@types/es6-promise": "^3.3.0",
-    "@types/node": "^10.5.5",
+    "@types/node": "^10.5.6",
     "@types/pako": "^1.0.0",
-    "@types/pdf": "0.0.31",
+    "@types/pdfjs-dist": "^0.1.2",
     "es6-promise": "^4.2.4",
     "rimraf": "^2.6.2",
     "tslint": "^5.11.0",