chore: upgrade pdfobject to 2.1.1

Signed-off-by: BoHong Li <raccoon@hackmd.io>

Author: a60814billy

package.json

@@ -114,7 +114,7 @@
     "passport-saml": "~1.0.0",
     "passport-twitter": "~1.0.4",
     "passport.socketio": "~3.7.0",
-    "pdfobject": "~2.0.201604172",
+    "pdfobject": "~2.1.1",
     "pg": "~6.1.2",
     "pg-hstore": "~2.3.2",
     "plantuml-encoder": "^1.2.5",

yarn.lock

@@ -9624,10 +9624,10 @@ pbkdf2@^3.0.3:
     safe-buffer "^5.0.1"
     sha.js "^2.4.8"
 
-pdfobject@~2.0.201604172:
-  version "2.0.201604172"
-  resolved "https://registry.yarnpkg.com/pdfobject/-/pdfobject-2.0.201604172.tgz#112edf93b98be121a5e780b06e7f5f78ad31ab3f"
-  integrity sha1-ES7fk7mL4SGl54Cwbn9feK0xqz8=
+pdfobject@~2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/pdfobject/-/pdfobject-2.1.1.tgz#2949d4d218d130d16b6149c7f7226f0a73400d4a"
+  integrity sha512-QFktTHyjs4q/WhGFfV2RdAbscPdNkyQb/JfFz18cwILvs9ocDiYVFAEh/jgkKGv6my+r4nlbLjwj7BHFKAupHQ==
 
 pend@~1.2.0:
   version "1.2.0"