add CHANGELOG

Author: homeyer

CHANGELOG.md

@@ -0,0 +1,9 @@
+## 3.0.0 (2015-07-15)
+
+Bugfixes:
+
+  - Stop swallowing errors if the prerender service fails.
+
+    Before: If the prerender service errors out (e.g., not available and the request times out), the error is swallowed and `next` called with no args.
+
+    After: error is passed through to `next`, and `prerender.afterRenderFn` is handed `err` as the first arg. Makes it much easier to know if you're misconfiguring something or forgot to start the prerender server locally when testing.