[ruby-cvs:57324] kazu:r50175 (trunk): fix a typo [ci skip]

[kazu at ruby-lang.org]

kazu	2015-04-07 00:00:00 +0900 (Tue, 07 Apr 2015)

  New Revision: 50175

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=50175

  Log:
    fix a typo [ci skip]

  Modified files:
    trunk/tool/downloader.rb