NEWS: Add String/Symbol#casecmp? [Feature #12786]

[ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56932 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -140,6 +140,8 @@ with all sufficient information, see the ChangeLog file or Redmine
 
 * String
 
+  * String#casecmp? [Feature #12786]
+
   * String#upcase, String#downcase, String#capitalize, String#swapcase and
     their bang variants work for all of Unicode, and are no longer limited
     to ASCII. Supported encodings are UTF-8, UTF-16BE/LE, UTF-32BE/LE, and
@@ -153,6 +155,8 @@ with all sufficient information, see the ChangeLog file or Redmine
 
 * Symbol
 
+  * Symbol#casecmp? [Feature #12786]
+
   * Symbol#match now returns MatchData.  [Bug #11991]
 
   * Symbol#upcase, Symbol#downcase, Symbol#capitalize, and Symbol#swapcase now