Remove unnecessary code causing a warning on 1.9.3.
Remove unnecessary code causing a warning on 1.9.3.

/home/vagrant/builds/myronmarston/vcr/spec/quality_spec.rb:6: warning: setting Encoding.default_external
chriswoodrich/vcr,intfrr/vcr,asymmetric/vcr,ihassin/vcr,chriswoodrich/vcr,mcfiredrill/vcr,davidbebb/vcr,irfanah/vcr,allyapp/vcr,Shopify/vcr,myronmarston/vcr,nishanbose/vcr,cemo/vcr,ihassin/vcr,myronmarston/vcr,nishanbose/vcr,cemo/vcr,mcfiredrill/vcr,intfrr/vcr,irfanah/vcr,ZmagoD/vcr,ZmagoD/vcr,Shopify/vcr,allyapp/vcr,davidbebb/vcr,asymmetric/vcr