Remove missing files from gemspec that are prevent gem building

Hi, I wanted to use the latest build as it has a fix for issue #284 so I changed my Gemfile to point to the git repo.

However, bundle update fails...

    Using whois (3.4.1) from git@github.com:weppos/whois.git (at master) 
    whois at /home/boncey/.rvm/gems/ruby-1.9.3-p392/bundler/gems/whois-2df15b40355e did not have a valid gemspec.
    This prevents bundler from installing bins or native extensions, but that may not affect its functionality.
    The validation message from Rubygems was:
          ["lib/whois/record/parser/NOTES.txt", "lib/whois/record/scanners/whois.ascio.com.rb"] are not files

So I've removed those entries from the gemspec to allow it to build.