Use `Dir.mktmpdir`
Use `Dir.mktmpdir`

As `@cache_path` is expected to be a directory name, use `Dir.mktmpdir`.
And omit unnecessary `Dir.tmpdir`.
georgeclaghorn/rails,mohitnatoo/rails,prathamesh-sonpatki/rails,esparta/rails,aditya-kapoor/rails,eileencodes/rails,esparta/rails,Vasfed/rails,illacceptanything/illacceptanything,brchristian/rails,jeremy/rails,kddeisz/rails,kddeisz/rails,printercu/rails,starknx/rails,BlakeWilliams/rails,yawboakye/rails,Vasfed/rails,BlakeWilliams/rails,arunagw/rails,repinel/rails,rafaelfranca/omg-rails,mechanicles/rails,Envek/rails,yalab/rails,gauravtiwari/rails,printercu/rails,Stellenticket/rails,EmmaB/rails-1,mohitnatoo/rails,EmmaB/rails-1,vipulnsward/rails,tgxworld/rails,betesh/rails,illacceptanything/illacceptanything,lcreid/rails,baerjam/rails,yawboakye/rails,palkan/rails,vipulnsward/rails,assain/rails,prathamesh-sonpatki/rails,deraru/rails,brchristian/rails,odedniv/rails,baerjam/rails,aditya-kapoor/rails,baerjam/rails,gauravtiwari/rails,gfvcastro/rails,repinel/rails,esparta/rails,assain/rails,yalab/rails,schuetzm/rails,iainbeeston/rails,MSP-Greg/rails,shioyama/rails,georgeclaghorn/rails,prathamesh-sonpatki/rails,lcreid/rails,mechanicles/rails,iainbeeston/rails,Stellenticket/rails,yahonda/rails,flanger001/rails,starknx/rails,MSP-Greg/rails,travisofthenorth/rails,starknx/rails,gfvcastro/rails,kddeisz/rails,illacceptanything/illacceptanything,flanger001/rails,Erol/rails,Envek/rails,assain/rails,deraru/rails,printercu/rails,betesh/rails,fabianoleittes/rails,yasslab/railsguides.jp,illacceptanything/illacceptanything,pvalena/rails,rails/rails,gauravtiwari/rails,joonyou/rails,iainbeeston/rails,aditya-kapoor/rails,eileencodes/rails,rails/rails,eileencodes/rails,printercu/rails,deraru/rails,kmcphillips/rails,untidy-hair/rails,tjschuck/rails,utilum/rails,utilum/rails,palkan/rails,jeremy/rails,schuetzm/rails,tgxworld/rails,arunagw/rails,mechanicles/rails,kddeisz/rails,yasslab/railsguides.jp,illacceptanything/illacceptanything,tjschuck/rails,tgxworld/rails,pvalena/rails,yhirano55/rails,Edouard-chin/rails,illacceptanything/illacceptanything,yahonda/rails,vipulnsward/rails,tjschuck/rails,notapatch/rails,odedniv/rails,betesh/rails,assain/rails,baerjam/rails,rafaelfranca/omg-rails,iainbeeston/rails,jeremy/rails,MSP-Greg/rails,illacceptanything/illacceptanything,BlakeWilliams/rails,travisofthenorth/rails,yawboakye/rails,utilum/rails,yasslab/railsguides.jp,illacceptanything/illacceptanything,Edouard-chin/rails,jeremy/rails,tgxworld/rails,palkan/rails,shioyama/rails,travisofthenorth/rails,BlakeWilliams/rails,fabianoleittes/rails,Stellenticket/rails,mohitnatoo/rails,illacceptanything/illacceptanything,gfvcastro/rails,Erol/rails,joonyou/rails,untidy-hair/rails,fabianoleittes/rails,Edouard-chin/rails,kmcphillips/rails,illacceptanything/illacceptanything,yawboakye/rails,yasslab/railsguides.jp,Vasfed/rails,joonyou/rails,joonyou/rails,illacceptanything/illacceptanything,gfvcastro/rails,yahonda/rails,untidy-hair/rails,mechanicles/rails,bogdanvlviv/rails,repinel/rails,EmmaB/rails-1,kmcphillips/rails,deraru/rails,fabianoleittes/rails,esparta/rails,rafaelfranca/omg-rails,yahonda/rails,mohitnatoo/rails,shioyama/rails,brchristian/rails,yalab/rails,Envek/rails,prathamesh-sonpatki/rails,pvalena/rails,illacceptanything/illacceptanything,lcreid/rails,travisofthenorth/rails,schuetzm/rails,bogdanvlviv/rails,kmcphillips/rails,arunagw/rails,Edouard-chin/rails,georgeclaghorn/rails,pvalena/rails,flanger001/rails,notapatch/rails,odedniv/rails,Vasfed/rails,flanger001/rails,bogdanvlviv/rails,Envek/rails,untidy-hair/rails,illacceptanything/illacceptanything,yhirano55/rails,yhirano55/rails,georgeclaghorn/rails,illacceptanything/illacceptanything,MSP-Greg/rails,yhirano55/rails,notapatch/rails,Erol/rails,yalab/rails,palkan/rails,vipulnsward/rails,arunagw/rails,schuetzm/rails,utilum/rails,shioyama/rails,illacceptanything/illacceptanything,eileencodes/rails,Stellenticket/rails,rails/rails,Erol/rails,repinel/rails,aditya-kapoor/rails,notapatch/rails,betesh/rails,lcreid/rails,tjschuck/rails,bogdanvlviv/rails,rails/rails