Unlock TypeScript dependency

Since microsoft/TypeScript#8191 is now fixed

Author: Godhuda

package.json

@@ -36,7 +36,7 @@
     "handlebars": "^3.0.2",
     "qunit": "^0.7.2",
     "simple-html-tokenizer": "^0.2.3",
-    "typescript": "1.9.0-dev.20160407"
+    "typescript": "next"
   },
   "devDependencies": {
     "benchmark": "^1.0.0",
@@ -45,6 +45,6 @@
     "ember-cli-release": "^0.2.2",
     "ember-cli-sauce": "^1.3.0",
     "tslint": "next",
-    "typescript": "1.9.0-dev.20160407"
+    "typescript": "next"
   }
 }