Update migrations.md
Update migrations.md

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