fix(npm): update angular 2 peer dependency

BREAKING CHANGE: the lib now only works with beta >=16 because of a change in pipe arguments

Author: ocombe

package.json

@@ -27,7 +27,7 @@
   "typings": "./ng2-translate.d.ts",
   "homepage": "https://github.com/ocombe/ng2-translate",
   "peerDependencies": {
-    "angular2": ">= 2.0.0-beta.10"
+    "angular2": ">= 2.0.0-beta.16"
   },
   "devDependencies": {
     "angular2": "2.0.0-beta.16",