Include guides in the release notes

Author: rafaelfranca

tools/releaser/lib/releaser.rb

@@ -229,7 +229,7 @@ def update_versions(framework)
   def release_notes
     release_notes = "#{version}\n"
 
-    FRAMEWORKS.each do |framework|
+    (FRAMEWORKS + ["guides"]).each do |framework|
       release_notes << "## #{framework_name(framework)}\n"
       file_name = File.join root, framework, "CHANGELOG.md"
       contents = File.readlines file_name

tools/releaser/test/releaser_test.rb

@@ -216,6 +216,11 @@ def test_release_notes_returns_the_release_notes_for_a_framework
         *  Changes in Railties
 
 
+        ## Guides
+
+        *  Change in guides
+
+
       RELEASE_NOTES
     end
   end