updated raindrops gem version to 0.17.0 for TravisCI.
updated raindrops gem version to 0.17.0 for TravisCI.

takaokouji/smalruby-editor,smalruby/smalruby-editor,takaokouji/smalruby-editor,smalruby/smalruby-editor,smalruby/smalruby-editor,takaokouji/smalruby-editor