Add Active Job info to 5.1 release notes
Add Active Job info to 5.1 release notes

[ci skip]

deraru/rails,tgxworld/rails,iainbeeston/rails,flanger001/rails,odedniv/rails,schuetzm/rails,illacceptanything/illacceptanything,Envek/rails,Envek/rails,utilum/rails,brchristian/rails,palkan/rails,yhirano55/rails,pvalena/rails,yhirano55/rails,betesh/rails,printercu/rails,assain/rails,illacceptanything/illacceptanything,yawboakye/rails,illacceptanything/illacceptanything,yhirano55/rails,ledestin/rails,vipulnsward/rails,MSP-Greg/rails,untidy-hair/rails,pvalena/rails,mechanicles/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,flanger001/rails,repinel/rails,assain/rails,bogdanvlviv/rails,gfvcastro/rails,eileencodes/rails,vipulnsward/rails,shioyama/rails,Edouard-chin/rails,xlymian/rails,Sen-Zhang/rails,mechanicles/rails,lcreid/rails,Envek/rails,maicher/rails,arunagw/rails,rossta/rails,bogdanvlviv/rails,mohitnatoo/rails,mijoharas/rails,ledestin/rails,kamipo/rails,mechanicles/rails,mechanicles/rails,EmmaB/rails-1,lcreid/rails,yalab/rails,gcourtemanche/rails,printercu/rails,jeremy/rails,shioyama/rails,schuetzm/rails,utilum/rails,maicher/rails,gauravtiwari/rails,brchristian/rails,tgxworld/rails,Erol/rails,joonyou/rails,travisofthenorth/rails,kddeisz/rails,kaspth/rails,gauravtiwari/rails,bogdanvlviv/rails,tjschuck/rails,iainbeeston/rails,joonyou/rails,jeremy/rails,BlakeWilliams/rails,tjschuck/rails,pschambacher/rails,illacceptanything/illacceptanything,kmayer/rails,printercu/rails,lucasmazza/rails,rafaelfranca/omg-rails,riseshia/railsguides.kr,betesh/rails,jeremy/rails,georgeclaghorn/rails,kaspth/rails,repinel/rails,ngpestelos/rails,yawboakye/rails,repinel/rails,illacceptanything/illacceptanything,utilum/rails,palkan/rails,notapatch/rails,Stellenticket/rails,gfvcastro/rails,prathamesh-sonpatki/rails,assain/rails,xlymian/rails,deraru/rails,xlymian/rails,mohitnatoo/rails,aditya-kapoor/rails,prathamesh-sonpatki/rails,illacceptanything/illacceptanything,bradleypriest/rails,starknx/rails,fabianoleittes/rails,kddeisz/rails,rails/rails,felipecvo/rails,Edouard-chin/rails,pvalena/rails,EmmaB/rails-1,Stellenticket/rails,tjschuck/rails,ttanimichi/rails,Erol/rails,bradleypriest/rails,illacceptanything/illacceptanything,mathieujobin/reduced-rails-for-travis,kmcphillips/rails,esparta/rails,Edouard-chin/rails,felipecvo/rails,assain/rails,koic/rails,alecspopa/rails,illacceptanything/illacceptanything,kaspth/rails,kamipo/rails,aditya-kapoor/rails,mijoharas/rails,shioyama/rails,matrinox/rails,yasslab/railsguides.jp,tjschuck/rails,hanystudy/rails,koic/rails,Edouard-chin/rails,palkan/rails,untidy-hair/rails,bogdanvlviv/rails,yahonda/rails,georgeclaghorn/rails,bradleypriest/rails,kmcphillips/rails,brchristian/rails,palkan/rails,baerjam/rails,baerjam/rails,lcreid/rails,ttanimichi/rails,BlakeWilliams/rails,arunagw/rails,printercu/rails,starknx/rails,matrinox/rails,kddeisz/rails,notapatch/rails,kirs/rails-1,esparta/rails,illacceptanything/illacceptanything,yawboakye/rails,eileencodes/rails,gfvcastro/rails,georgeclaghorn/rails,pschambacher/rails,vipulnsward/rails,schuetzm/rails,Stellenticket/rails,iainbeeston/rails,arunagw/rails,Vasfed/rails,yalab/rails,Sen-Zhang/rails,kamipo/rails,hanystudy/rails,tgxworld/rails,Erol/rails,MSP-Greg/rails,rails/rails,mathieujobin/reduced-rails-for-travis,Sen-Zhang/rails,odedniv/rails,shioyama/rails,notapatch/rails,lucasmazza/rails,kmcphillips/rails,mohitnatoo/rails,lucasmazza/rails,untidy-hair/rails,Vasfed/rails,gcourtemanche/rails,fabianoleittes/rails,deraru/rails,kddeisz/rails,odedniv/rails,yhirano55/rails,BlakeWilliams/rails,joonyou/rails,ledestin/rails,MSP-Greg/rails,betesh/rails,ngpestelos/rails,yahonda/rails,alecspopa/rails,yawboakye/rails,EmmaB/rails-1,aditya-kapoor/rails,hanystudy/rails,alecspopa/rails,esparta/rails,prathamesh-sonpatki/rails,arunagw/rails,koic/rails,pvalena/rails,jeremy/rails,ngpestelos/rails,Erol/rails,maicher/rails,georgeclaghorn/rails,riseshia/railsguides.kr,kirs/rails-1,travisofthenorth/rails,MSP-Greg/rails,gauravtiwari/rails,BlakeWilliams/rails,yasslab/railsguides.jp,iainbeeston/rails,flanger001/rails,schuetzm/rails,lcreid/rails,eileencodes/rails,kmayer/rails,illacceptanything/illacceptanything,yasslab/railsguides.jp,untidy-hair/rails,yalab/rails,ttanimichi/rails,notapatch/rails,yasslab/railsguides.jp,yahonda/rails,kmayer/rails,rossta/rails,mijoharas/rails,Stellenticket/rails,pschambacher/rails,fabianoleittes/rails,riseshia/railsguides.kr,illacceptanything/illacceptanything,betesh/rails,starknx/rails,Vasfed/rails,Vasfed/rails,repinel/rails,rossta/rails,illacceptanything/illacceptanything,felipecvo/rails,eileencodes/rails,gcourtemanche/rails,kirs/rails-1,joonyou/rails,mathieujobin/reduced-rails-for-travis,travisofthenorth/rails,esparta/rails,kmcphillips/rails,baerjam/rails,yahonda/rails,rafaelfranca/omg-rails,vipulnsward/rails,gfvcastro/rails,deraru/rails,matrinox/rails,riseshia/railsguides.kr,Envek/rails,prathamesh-sonpatki/rails,rafaelfranca/omg-rails,mohitnatoo/rails,yalab/rails,baerjam/rails,rails/rails,flanger001/rails,travisofthenorth/rails,aditya-kapoor/rails,fabianoleittes/rails,illacceptanything/illacceptanything,utilum/rails,rails/rails,tgxworld/rails