Added polls label on issue without a poll

[bkeepers]

This issue includes a URL that has polls, which appeared to trigger the polls app: probot/probot.github.io#95

e.g.

[Take my poll](https://example.com/poll/vote)

[bkeepers]

Actually, I misunderstood what triggered it. Here's the code in question

Errno::ENOENT: No such file or directory @ rb_sysopen -
/home/travis/.rvm/rubies/ruby-2.4.0/lib/ruby/site_ruby/2.4.0/bundler/templates/Executable
An error occurred while installing concurrent-ruby (1.0.5), and Bundler cannot
continue.
Make sure that `gem install concurrent-ruby -v '1.0.5'` succeeds before
bundling.

It appears that the line starting with /home/travis/.rvm/rubies/ruby-2.4.0/lib/ruby/site_ruby/2.4.0/bundler/templates/Executable is triggering the poll behavior.

[evenchange4]

This should be fixed now. Thanks for reporting!

Close it via RegExp bugfix PR#14. Please feel free to reopen this issue if the problem still occurs.