Add warning when loading plugins of type composer-installer as they are unlikely to function correctly and should be upgraded to the composer-plugin type
Add warning when loading plugins of type composer-installer as they are unlikely to function correctly and should be upgraded to the composer-plugin type

stof/composer,stefangr/composer,staabm/composer,alcohol/composer,johnstevenson/composer,nicolas-grekas/composer,composer/composer,milleruk/composer