Merge pull request #290 from OneNoteDev/bug/pdfjs-update

Update to pdf.js 1.6.422

Author: leakymemory

package.json

@@ -55,7 +55,7 @@
     "node-static": "0.7.9",
     "onenoteapi": "1.1.0",
     "onenotepicker": "1.0.6",
-    "pdfjs-dist": "1.6.319",
+    "pdfjs-dist": "1.6.422",
     "popper.js": "0.6.4",
     "qunitjs": "1.20.0",
     "rangy": "1.3.0",