Modified: unicode escape BULLET instead of adding magic comment

fixed following error for ruby 19.

```
/Users/gdansk/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/git-trend-0.1.1/lib/git_trend/cli.rb:24:in `list': /Users/gdansk/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/git-trend-0.1.1/lib/git_trend/scraper.rb:54: invalid multibyte char (US-ASCII) (SyntaxError)
/Users/gdansk/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/git-trend-0.1.1/lib/git_trend/scraper.rb:54: invalid multibyte char (US-ASCII)
/Users/gdansk/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/git-trend-0.1.1/lib/git_trend/scraper.rb:54: syntax error, unexpected $end, expecting ')'
      meta_data = text.split('•').map { |x| x.gsub("\n", '').strip }
                                ^
```