Update CHANGELOG

CHANGELOG.markdown

@@ -1,6 +1,29 @@
 COMPASS CHANGELOG
 =================
 
+0.10.0.rc2 (April 12, 2010)
+---------------------------
+**IMPORTANT:**
+
+* Compass now depends on Sass 3 -- Please be prepared to upgrade.
+  Things won't break but you'll have a lot of deprecation warnings.
+  Upgrading is pretty easy thanks to the `sass-convert` tool. See the
+  [Sass Changelog](http://beta.sass-lang.com/docs/yardoc/file.SASS_CHANGELOG.html)
+  for more information.
+* All compass stylesheets are now written in the SCSS syntax,
+  if you import compass framework stylesheets with an explicit
+  `.sass` extension, then you'll receive deprecation warnings
+  directing you to update your stylesheets.
+* A new command line switch `--syntax` (or `-x`) has been added
+  to commands that install stylesheets into your project that
+  allows you to select the syntax to use (scss or sass)
+* A new configuration option `preferred_syntax` now exists
+  and defaults to `:scss`. Please update your project's configuration
+  file with `preferred_syntax = :sass` if you prefer to use the
+  indentation-based syntax.
+* You may silence deprecation warnings by adding
+  `sass_options = {:quiet => true}` to your configuration.
+
 0.10.0.pre9 (March 6, 2010)
 ---------------------------