Fix Ruby 1.8.7 warning about regex syntax.
Fix Ruby 1.8.7 warning about regex syntax.

Noticed this when running against Ruby 1.8.7, there were two repeated
warnings based on improper escaped brackets:

- spec/rspec/rails/matchers/route_to_spec.rb:114:
  > warning: regexp has invalid interval

- spec/rspec/rails/matchers/route_to_spec.rb:114:
  > warning: regexp has `}' without escape

pjaspers/rspec-rails,sopheak-se/rspec-rails,KlotzAndrew/rspec-rails,AEgan/rspec-rails,tjgrathwell/rspec-rails,unite-us/rspec-rails,jpbamberg1993/rspec-rails,mcfiredrill/rspec-rails,unite-us/rspec-rails,grantgeorge/rspec-rails,DarthSim/rspec-rails,sarahmei/rspec-rails,jamelablack/rspec-rails,maclover7/rspec-rails,aceofspades/rspec-rails,jamelablack/rspec-rails,KlotzAndrew/rspec-rails,eliotsykes/rspec-rails,ipmobiletech/rspec-rails,jdax/rspec-rails,jdax/rspec-rails,jpbamberg1993/rspec-rails,DarthSim/rspec-rails,mcfiredrill/rspec-rails,Kriechi/rspec-rails,sarahmei/rspec-rails,maclover7/rspec-rails,AEgan/rspec-rails,ipmobiletech/rspec-rails,tjgrathwell/rspec-rails,mkyaw/rspec-rails,gkunwar/rspec-rails,jpbamberg1993/rspec-rails,aceofspades/rspec-rails,rspec/rspec-rails,jasnow/rspec-rails,powershop/rspec-rails,dcrec1/rspec-rails-1,unite-us/rspec-rails,eliotsykes/rspec-rails,ipmobiletech/rspec-rails,KlotzAndrew/rspec-rails,tjgrathwell/rspec-rails,DarthSim/rspec-rails,jasnow/rspec-rails,rspec/rspec-rails,sopheak-se/rspec-rails,pjaspers/rspec-rails,grantgeorge/rspec-rails,dcrec1/rspec-rails-1,pjaspers/rspec-rails,gkunwar/rspec-rails,AEgan/rspec-rails,gkunwar/rspec-rails,sopheak-se/rspec-rails,mkyaw/rspec-rails,mkyaw/rspec-rails,jdax/rspec-rails,grantgeorge/rspec-rails,mcfiredrill/rspec-rails,dcrec1/rspec-rails-1,maclover7/rspec-rails,eliotsykes/rspec-rails,rspec/rspec-rails,sarahmei/rspec-rails,jasnow/rspec-rails,powershop/rspec-rails,Kriechi/rspec-rails,Kriechi/rspec-rails,jamelablack/rspec-rails,aceofspades/rspec-rails,powershop/rspec-rails