Add v5.1 to earlier releases list in guide [ci skip]
Add v5.1 to earlier releases list in guide [ci skip]

mechanicles/rails,illacceptanything/illacceptanything,mechanicles/rails,MSP-Greg/rails,yasslab/railsguides.jp,Vasfed/rails,eileencodes/rails,betesh/rails,tgxworld/rails,fabianoleittes/rails,Stellenticket/rails,mohitnatoo/rails,repinel/rails,kmcphillips/rails,shioyama/rails,aditya-kapoor/rails,kmcphillips/rails,kamipo/rails,fabianoleittes/rails,BlakeWilliams/rails,joonyou/rails,odedniv/rails,lcreid/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,EmmaB/rails-1,utilum/rails,kddeisz/rails,betesh/rails,esparta/rails,untidy-hair/rails,yalab/rails,flanger001/rails,MSP-Greg/rails,mechanicles/rails,Erol/rails,arunagw/rails,iainbeeston/rails,untidy-hair/rails,baerjam/rails,Stellenticket/rails,mechanicles/rails,fabianoleittes/rails,travisofthenorth/rails,assain/rails,vipulnsward/rails,bogdanvlviv/rails,starknx/rails,gfvcastro/rails,starknx/rails,deraru/rails,schuetzm/rails,printercu/rails,yahonda/rails,bogdanvlviv/rails,yhirano55/rails,Erol/rails,starknx/rails,mohitnatoo/rails,kmcphillips/rails,baerjam/rails,prathamesh-sonpatki/rails,georgeclaghorn/rails,yasslab/railsguides.jp,joonyou/rails,fabianoleittes/rails,schuetzm/rails,odedniv/rails,lcreid/rails,rails/rails,vipulnsward/rails,rails/rails,yalab/rails,untidy-hair/rails,shioyama/rails,illacceptanything/illacceptanything,yhirano55/rails,Erol/rails,joonyou/rails,repinel/rails,utilum/rails,iainbeeston/rails,palkan/rails,yawboakye/rails,untidy-hair/rails,illacceptanything/illacceptanything,prathamesh-sonpatki/rails,brchristian/rails,Stellenticket/rails,vipulnsward/rails,utilum/rails,kirs/rails-1,BlakeWilliams/rails,rails/rails,assain/rails,kirs/rails-1,tjschuck/rails,prathamesh-sonpatki/rails,Edouard-chin/rails,jeremy/rails,rafaelfranca/omg-rails,georgeclaghorn/rails,yhirano55/rails,printercu/rails,shioyama/rails,gfvcastro/rails,yahonda/rails,Vasfed/rails,travisofthenorth/rails,MSP-Greg/rails,aditya-kapoor/rails,kddeisz/rails,Envek/rails,pvalena/rails,assain/rails,kmcphillips/rails,pvalena/rails,Vasfed/rails,lcreid/rails,esparta/rails,bogdanvlviv/rails,rails/rails,tjschuck/rails,flanger001/rails,lcreid/rails,betesh/rails,mohitnatoo/rails,vipulnsward/rails,BlakeWilliams/rails,flanger001/rails,yahonda/rails,repinel/rails,gauravtiwari/rails,brchristian/rails,illacceptanything/illacceptanything,yalab/rails,aditya-kapoor/rails,tgxworld/rails,eileencodes/rails,yawboakye/rails,Envek/rails,illacceptanything/illacceptanything,esparta/rails,Envek/rails,deraru/rails,pvalena/rails,prathamesh-sonpatki/rails,notapatch/rails,Edouard-chin/rails,notapatch/rails,deraru/rails,EmmaB/rails-1,Edouard-chin/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,illacceptanything/illacceptanything,Stellenticket/rails,BlakeWilliams/rails,gauravtiwari/rails,baerjam/rails,yasslab/railsguides.jp,assain/rails,illacceptanything/illacceptanything,kamipo/rails,esparta/rails,kddeisz/rails,deraru/rails,yawboakye/rails,eileencodes/rails,printercu/rails,rafaelfranca/omg-rails,illacceptanything/illacceptanything,betesh/rails,gfvcastro/rails,illacceptanything/illacceptanything,repinel/rails,jeremy/rails,illacceptanything/illacceptanything,gauravtiwari/rails,yahonda/rails,palkan/rails,kirs/rails-1,Erol/rails,jeremy/rails,illacceptanything/illacceptanything,pvalena/rails,tjschuck/rails,jeremy/rails,flanger001/rails,arunagw/rails,arunagw/rails,tjschuck/rails,baerjam/rails,arunagw/rails,yhirano55/rails,Vasfed/rails,printercu/rails,Envek/rails,kddeisz/rails,schuetzm/rails,iainbeeston/rails,illacceptanything/illacceptanything,eileencodes/rails,aditya-kapoor/rails,kamipo/rails,notapatch/rails,utilum/rails,yawboakye/rails,palkan/rails,gfvcastro/rails,schuetzm/rails,joonyou/rails,odedniv/rails,tgxworld/rails,bogdanvlviv/rails,travisofthenorth/rails,tgxworld/rails,EmmaB/rails-1,georgeclaghorn/rails,mohitnatoo/rails,palkan/rails,yalab/rails,shioyama/rails,travisofthenorth/rails,notapatch/rails,iainbeeston/rails,yasslab/railsguides.jp,MSP-Greg/rails,rafaelfranca/omg-rails,brchristian/rails,Edouard-chin/rails