matz	2007-04-20 00:56:04 +0900 (Fri, 20 Apr 2007)

  New Revision: 12197

  Modified files:
    branches/matzruby/ChangeLog
    branches/matzruby/math.c

  Log:
    * math.c (math_log): update document to mention second optional
      argument for logarithm base.

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/branches/matzruby/ChangeLog?r1=12197&r2=12196
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/branches/matzruby/math.c?r1=12197&r2=12196