add back binding reference

Author: danielpeintner

package-lock.json

@@ -15,6 +15,7 @@
     "types": "dist/ws.d.ts",
     "browser": "dist/ws-browser.js",
     "dependencies": {
+        "@node-wot/binding-http": "0.9.2",
         "@node-wot/core": "0.9.2",
         "rxjs": "^5.5.11",
         "slugify": "^1.4.5",