Use cid3 on Heroku (#3001)

Use https://github.com/heroku/heroku-buildpack-apt to
install protobuf-compiler and libprotobuf-dev which are needed by cid3

Aptfile

+protobuf-compiler
+libprotobuf-dev

app.json

@@ -94,6 +94,9 @@
     }
   },
   "buildpacks": [
+    {
+      "url": "https://github.com/heroku/heroku-buildpack-apt"
+    },
     {
       "url": "heroku/nodejs"
     },