Update CHANGELOG.

Author: cscott

CHANGELOG.md

@@ -1,4 +1,11 @@
 # php-embed x.x.x (not yet released)
+* Add synchronous PHP access to JavaScript variables, functions, and
+  methods.
+* Wrap JavaScript Buffer objects so they can be passed from PHP to JS.
+  This allows us to avoid decoding/re-encoding UTF-8 when we stream
+  data back from PHP.
+* Node >= 2.4.0 is now required, due to use of C++11 features and
+  v8's `NativeWeakMap`.
 
 # php-embed 0.0.1 (2015-10-10)
 * Initial release: just a basic async invocation of a PHP request,