spec/pry_output_spec.rb: test colour leaks for Object literals
spec/pry_output_spec.rb: test colour leaks for Object literals

This ensures that CodeRay does not leak colours.
For more information see the following commit:

c544c1d69974e3505175d25fab69bb9e74674965

printercu/pry,ooohiroyukiooo/pry,tdg5/pry,85x14/pry,scalixte-mdsol/pry,sferik/pry,geoffreylitt/pry,scalixte-mdsol/pry,shockone/pry,jasnow/pry,jasonm23/pry,caporta/pry,jasnow/pry,shockone/pry,pvdb/pry,icebreaker/pry,raeno/pry,85x14/pry,tdg5/pry,sideci-sample/sideci-sample-pry,nju520/pry,85x14/pry,nju520/pry,josue804/debunker,jasonm23/pry,shockone/pry,jasonm23/pry,ngpestelos/pry,raeno/pry,scalixte-mdsol/pry,ooohiroyukiooo/pry,printercu/pry,josue804/debunker,geoffreylitt/pry,caporta/pry,deivid-rodriguez/pry,sferik/pry,raeno/pry,bronzdoc/pry,pvdb/pry,nju520/pry,tdg5/pry,jasnow/pry,icebreaker/pry,ooohiroyukiooo/pry,gfvcastro/pry,gfvcastro/pry,caporta/pry,ngpestelos/pry,bronzdoc/pry