Refactor migration.rb
Refactor migration.rb

Allow migration files to have more than 3 digits

mpalmer/sequel,dennis-d/custom_sequel,t-morgan/sequel,nicohvi/sequel,reubano/sequel,davidbegin/sequel,offshore-safety/sequel,seeARMS/sequel,t-morgan/sequel,freshpay/sequel,beni55/sequel,bigfix/sequel,yazshel/sequel,seeARMS/sequel,Marketcircle/sequel,petergunz/sequel,yazshel/sequel,uhoh-itsmaciek/sequel,beni55/sequel,freshpay/sequel,nju520/sequel,tmm1/sequel,knut2/sequel,reubano/sequel,davidbegin/sequel,uhoh-itsmaciek/sequel,offshore-safety/sequel,nicohvi/sequel,pfarrell/sequel,nju520/sequel,mpalmer/sequel,gferguson-gd/sequel,offshore-safety/sequel,chef/sequel,gferguson-gd/sequel,pfarrell/sequel,dennis-d/custom_sequel,knut2/sequel