NEWS: mention chomp option of String and StringIO

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56986 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -159,8 +159,16 @@ with all sufficient information, see the ChangeLog file or Redmine
   * String#concat, String#prepend [Feature #12333]
     Now takes multiple arguments.
 
+  * String#each_line, String#lines now takes an optional keyword argument,
+    chomp flag.  [Feature #12553]
+
   * String#unpack1 [Feature #12752]
 
+* StringIO
+
+  * StringIO#gets, StringIO#readline, StringIO#each_line, StringIO#readlines now takes
+    an optional keyword argument, chomp flag.  [Feature #12553]
+
 * Symbol
 
   * Symbol#casecmp? [Feature #12786]