Escape slashes in query strings.  This fixes #445
diff --git a/CHANGES b/CHANGES
index cfe4c43..ba820cc 100644
--- a/CHANGES
+++ b/CHANGES
@@ -31,6 +31,8 @@
   (`code_generator_class` and `context_class`) (pull request ``#404``).
 - added support for context/environment/evalctx decorator functions on
   the finalize callback of the environment.
+- escape query strings for urlencode properly.  Previously slashes were not
+  escaped in that place.
 
 Version 2.7.3
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