chore(package): update @types/node to version 7.0.19 (#527)

package.json

@@ -127,7 +127,7 @@
     "@types/express": "4.0.35",
     "@types/fluent-ffmpeg": "2.1.0",
     "@types/mime": "0.0.29",
-    "@types/node": "7.0.18",
+    "@types/node": "7.0.19",
     "@types/request": "0.0.43",
     "@types/sinon": "2.2.2",
     "@types/ws": "0.0.41",