update the version to be 0.2.1 of rendr, and this fix requires rendr to be at 0.5.1

Author: Josh Callender

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rendr-handlebars",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Glue handlebars templates into a Rendr app.",
   "main": "index.js",
   "scripts": {
@@ -15,7 +15,7 @@
     "handlebars": "1.3.0"
   },
   "peerDependencies": {
-    "rendr": ">=0.5.0"
+    "rendr": ">=0.5.1"
   },
   "keywords": [
     "rendr",