Update sequel_core/CHANGELOG for recent contributions
Update sequel_core/CHANGELOG for recent contributions

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