Merge pull request #1629 from zmwangx/bump-formula-pr-download-to-correct-version

bump-formula-pr: use correct version in download path when --version is specified

Library/Homebrew/dev-cmd/bump-formula-pr.rb

@@ -134,6 +134,7 @@ module Homebrew
       rsrc = Resource.new { @url = rsrc_url }
       rsrc.download_strategy = CurlDownloadStrategy
       rsrc.owner = Resource.new(formula.name)
+      rsrc.version = forced_version if forced_version
       rsrc_path = rsrc.fetch
       if Utils.popen_read("/usr/bin/tar", "-tf", rsrc_path) =~ %r{/.*\.}
         new_hash = rsrc_path.sha256