Widen constraints on analyzer from polymer & smoke.

pkg/polymer/CHANGELOG.md

Index: pkg/polymer/CHANGELOG.md
diff --git a/pkg/polymer/CHANGELOG.md b/pkg/polymer/CHANGELOG.md
index b3fc2a56f2bb225fe75f1602c9653e562898b079..494c115accd0a5bbcab1e9264f16f5d9aa709b0c 100644
--- a/pkg/polymer/CHANGELOG.md
+++ b/pkg/polymer/CHANGELOG.md
@@ -4,6 +4,10 @@ This file contains highlights of what changes on each version of the polymer
 package. We will also note important changes to the polyfill packages (observe,
 web_components, and template_binding) if they impact polymer.
 
+#### Pub version 0.12.0+6
+  * Widen the constraint on analyzer.
+  * Support for `_src` and similar attributes in polymer transformers.
+
 #### Pub version 0.12.0+5
   * Raise the lower bound on the source_maps constraint to exclude incompatible
     versions.