Tidied up lint errors in caching_spec.rb
Tidied up lint errors in caching_spec.rb

andyjeffries/flexirest,chenhang/active-rest-client,MoKuH/active-rest-client,whichdigital/active-rest-client,MatthieuKopec/active-rest-client,djpate/active-rest-client,andyjeffries/active-rest-client,chibicode/active-rest-client