fix issue 204 by escape special characters in root path such as '(', ')'

Author: rli9

lib/simplecov/defaults.rb

@@ -4,7 +4,7 @@
 SimpleCov.profiles.define 'root_filter' do
  # Exclude all files outside of simplecov root
  add_filter do |src|
- !(src.filename =~ /^#{SimpleCov.root}/)
+ !(src.filename =~ /^#{Regexp.escape(SimpleCov.root)}/)
  end
 end