NEWS: note about ERB's rendering performance

improvement.

There is no specific ticket for it, but improving the ERB's performance
was my largest passion that made me a Ruby committer.

See r58735, r58842, r58904, r58905, r58916.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61448 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -316,8 +316,11 @@ with all sufficient information, see the ChangeLog file or Redmine
 
 * ERB
 
+  * Rendering of ERB's compiled code becomes 2x faster.
+
   * Add ERB#result_with_hash to render a template with local variables passed
     with a Hash object. [Feature #8631]
+
   * Default template file encoding is changed from ASCII-8BIT to UTF-8 in erb
     command. [Bug #14095]