fix `http-basic` json example
fix `http-basic` json example

The JSON example for the `http-basic` option was missing the closing curly brace.
fabpot/composer,nicolas-grekas/composer,remicollet/composer,yaman-jain/composer,till/composer,fabiang/composer,alcohol/composer,floverdevel/composer,andrerom/composer,erasys/composer,stefangr/composer,dzuelke/composer,composer/composer,naderman/composer,davidolrik/composer,hirak/composer,stof/composer,gencer/composer,vdm-io/composer,johnstevenson/composer,JBleijenberg/composer,curry684/composer,localheinz/composer,balbuf/composer,slbmeh/composer,MoT3rror/composer,pierredup/composer,SpacePossum/composer,staabm/composer,milleruk/composer,jreinke/composer,phansys/composer