NEWS: Note for the bigdecimal versions

The differences between bigdecimal 1.3.5, 1.4.0, and 1.5.0 are explained.

[ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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@@ -353,6 +353,23 @@ sufficient information, see the ChangeLog file or Redmine
 
   * BigDecimal() accepts new keyword "exception:" similar to Float().
 
+  [Note for the differences among recent versions]
+
+  You should want to know the differences among recent versions of bigdecimal.
+  Please select the suitable version of bigdecimal according to the following
+  information.
+
+  * 1.3.5 has BigDecimal.new without "exception:" keyword.  You can see the
+    deprecation warning of BigDecimal.new when you specify "-w" option.
+    BigDecimal(), BigDecimal.new, and Object#to_d methods are same.
+
+  * 1.4.0 has BigDecimal.new with "exception:" keyword.  You always see the
+    deprecation warning of BigDecimal.new.  Object#to_d method is different
+    from BigDecimal() and BigDecimal.new.
+
+  * 1.5.0 will be released after releasing Ruby 2.6.0.  This version doesn't
+    have BigDecimal.new method.
+
 [Bundler]
 
   * Add Bundler to Standard Library. [Feature #12733]