Add missing "secure-http" config property
Add missing "secure-http" config property

"secure-http" configuration property recently introduced and available in documentation https://getcomposer.org/doc/06-config.md#secure-http is missing in the schema.
Soullivaneuh/composer,floverdevel/composer,phansys/composer,jreinke/composer,stof/composer,MoT3rror/composer,staabm/composer,curry684/composer,balbuf/composer,alcohol/composer,fabiang/composer,localheinz/composer,JBleijenberg/composer,naderman/composer,pierredup/composer,gencer/composer,milleruk/composer,hirak/composer,composer/composer,erasys/composer,till/composer,slbmeh/composer,yaman-jain/composer,andrerom/composer,nicolas-grekas/composer,fabpot/composer,vdm-io/composer,dzuelke/composer,SpacePossum/composer,davidolrik/composer,stefangr/composer,remicollet/composer,johnstevenson/composer