update release note: timestamps is non-null as default
update release note: timestamps is non-null as default

amoody2108/TechForJustice,maicher/rails,pvalena/rails,mechanicles/rails,eileencodes/rails,gauravtiwari/rails,yahonda/rails,bradleypriest/rails,vipulnsward/rails,esparta/rails,gcourtemanche/rails,palkan/rails,maicher/rails,rbhitchcock/rails,utilum/rails,elfassy/rails,koic/rails,maicher/rails,kmcphillips/rails,prathamesh-sonpatki/rails,Edouard-chin/rails,stefanmb/rails,mijoharas/rails,alecspopa/rails,flanger001/rails,Stellenticket/rails,elfassy/rails,Sen-Zhang/rails,iainbeeston/rails,EmmaB/rails-1,shioyama/rails,BlakeWilliams/rails,Erol/rails,printercu/rails,georgeclaghorn/rails,lucasmazza/rails,ledestin/rails,yawboakye/rails,matrinox/rails,gfvcastro/rails,voray/rails,gauravtiwari/rails,joonyou/rails,tijwelch/rails,xlymian/rails,palkan/rails,yasslab/railsguides.jp,mohitnatoo/rails,vipulnsward/rails,pvalena/rails,palkan/rails,aditya-kapoor/rails,aditya-kapoor/rails,yasslab/railsguides.jp,yhirano55/rails,coreyward/rails,rafaelfranca/omg-rails,esparta/rails,kmcphillips/rails,vassilevsky/rails,travisofthenorth/rails,odedniv/rails,tgxworld/rails,tijwelch/rails,fabianoleittes/rails,kachick/rails,vipulnsward/rails,utilum/rails,tjschuck/rails,schuetzm/rails,bogdanvlviv/rails,Vasfed/rails,lucasmazza/rails,pvalena/rails,brchristian/rails,deraru/rails,shioyama/rails,yhirano55/rails,rafaelfranca/omg-rails,lucasmazza/rails,georgeclaghorn/rails,repinel/rails,aditya-kapoor/rails,kenta-s/rails,tgxworld/rails,kddeisz/rails,ttanimichi/rails,eileencodes/rails,sergey-alekseev/rails,travisofthenorth/rails,sealocal/rails,tjschuck/rails,kachick/rails,yawboakye/rails,mtsmfm/rails,vipulnsward/rails,felipecvo/rails,baerjam/rails,Edouard-chin/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,yasslab/railsguides.jp,stefanmb/rails,MichaelSp/rails,richseviora/rails,rails/rails,koic/rails,mohitnatoo/rails,samphilipd/rails,bradleypriest/rails,kamipo/rails,iainbeeston/rails,schuetzm/rails,mijoharas/rails,rails/rails,hanystudy/rails,voray/rails,mathieujobin/reduced-rails-for-travis,notapatch/rails,Vasfed/rails,gauravtiwari/rails,riseshia/railsguides.kr,kmcphillips/rails,illacceptanything/illacceptanything,ngpestelos/rails,aditya-kapoor/rails,richseviora/rails,gfvcastro/rails,Spin42/rails,illacceptanything/illacceptanything,betesh/rails,coreyward/rails,gcourtemanche/rails,koic/rails,joonyou/rails,deraru/rails,Edouard-chin/rails,illacceptanything/illacceptanything,MichaelSp/rails,ledestin/rails,rbhitchcock/rails,mtsmfm/rails,MSP-Greg/rails,kenta-s/rails,tgxworld/rails,mohitnatoo/rails,tjschuck/rails,mathieujobin/reduced-rails-for-travis,joonyou/rails,fabianoleittes/rails,ngpestelos/rails,bogdanvlviv/rails,kddeisz/rails,matrinox/rails,Edouard-chin/rails,mohitnatoo/rails,yhirano55/rails,bolek/rails,Sen-Zhang/rails,kaspth/rails,illacceptanything/illacceptanything,untidy-hair/rails,sealocal/rails,pschambacher/rails,odedniv/rails,kamipo/rails,rbhitchcock/rails,marklocklear/rails,fabianoleittes/rails,kmcphillips/rails,bolek/rails,samphilipd/rails,jeremy/rails,assain/rails,arunagw/rails,palkan/rails,lcreid/rails,coreyward/rails,rossta/rails,MichaelSp/rails,marklocklear/rails,pvalena/rails,kmayer/rails,Envek/rails,assain/rails,richseviora/rails,bogdanvlviv/rails,Stellenticket/rails,shioyama/rails,marklocklear/rails,arunagw/rails,mechanicles/rails,gfvcastro/rails,elfassy/rails,kddeisz/rails,mtsmfm/railstest,kirs/rails-1,yahonda/rails,utilum/rails,georgeclaghorn/rails,assain/rails,rails/rails,amoody2108/TechForJustice,MSP-Greg/rails,mtsmfm/railstest,kirs/rails-1,voray/rails,vassilevsky/rails,illacceptanything/illacceptanything,Erol/rails,kmayer/rails,arjes/rails,jeremy/rails,mtsmfm/railstest,flanger001/rails,notapatch/rails,iainbeeston/rails,betesh/rails,EmmaB/rails-1,rossta/rails,arjes/rails,untidy-hair/rails,prathamesh-sonpatki/rails,travisofthenorth/rails,EmmaB/rails-1,illacceptanything/illacceptanything,illacceptanything/illacceptanything,lcreid/rails,schuetzm/rails,gfvcastro/rails,printercu/rails,jeremy/rails,sealocal/rails,kirs/rails-1,xlymian/rails,notapatch/rails,BlakeWilliams/rails,yawboakye/rails,Envek/rails,bolek/rails,untidy-hair/rails,mechanicles/rails,arunagw/rails,mtsmfm/rails,bogdanvlviv/rails,hanystudy/rails,notapatch/rails,BlakeWilliams/rails,illacceptanything/illacceptanything,yasslab/railsguides.jp,Vasfed/rails,baerjam/rails,kachick/rails,Envek/rails,sergey-alekseev/rails,bradleypriest/rails,stefanmb/rails,gavingmiller/rails,repinel/rails,Spin42/rails,kamipo/rails,shioyama/rails,printercu/rails,ttanimichi/rails,schuetzm/rails,tgxworld/rails,brchristian/rails,rossta/rails,arunagw/rails,MSP-Greg/rails,utilum/rails,rafaelfranca/omg-rails,deraru/rails,betesh/rails,88rabbit/newRails,illacceptanything/illacceptanything,yawboakye/rails,prathamesh-sonpatki/rails,MSP-Greg/rails,rails/rails,gcourtemanche/rails,kmayer/rails,baerjam/rails,mathieujobin/reduced-rails-for-travis,Sen-Zhang/rails,brchristian/rails,esparta/rails,yalab/rails,riseshia/railsguides.kr,pschambacher/rails,kaspth/rails,lcreid/rails,iainbeeston/rails,Vasfed/rails,repinel/rails,baerjam/rails,flanger001/rails,mechanicles/rails,travisofthenorth/rails,alecspopa/rails,tjschuck/rails,tijwelch/rails,ngpestelos/rails,assain/rails,yalab/rails,kddeisz/rails,untidy-hair/rails,sergey-alekseev/rails,riseshia/railsguides.kr,deraru/rails,kenta-s/rails,starknx/rails,ledestin/rails,matrinox/rails,fabianoleittes/rails,felipecvo/rails,odedniv/rails,printercu/rails,gavingmiller/rails,felipecvo/rails,Envek/rails,gavingmiller/rails,arjes/rails,yahonda/rails,jeremy/rails,flanger001/rails,samphilipd/rails,eileencodes/rails,ttanimichi/rails,betesh/rails,starknx/rails,repinel/rails,illacceptanything/illacceptanything,hanystudy/rails,Stellenticket/rails,88rabbit/newRails,illacceptanything/illacceptanything,Erol/rails,amoody2108/TechForJustice,alecspopa/rails,riseshia/railsguides.kr,yahonda/rails,Spin42/rails,Erol/rails,illacceptanything/illacceptanything,BlakeWilliams/rails,esparta/rails,mijoharas/rails,eileencodes/rails,lcreid/rails,vassilevsky/rails,illacceptanything/illacceptanything,pschambacher/rails,illacceptanything/illacceptanything,Stellenticket/rails,starknx/rails,joonyou/rails,prathamesh-sonpatki/rails,kaspth/rails,yalab/rails,yhirano55/rails,yalab/rails,88rabbit/newRails,xlymian/rails