Update README.md

Grammar correction
Reuse color support from Kafo

Installer output now uses color scheme selected by user. Also we don't
have to check color configuration manually. HighLine is already set by
Kafo.
Bump version to 1.6-develop
Add support for foreman-tasks
Use forked pl-apache while waiting for merge
Fix missing comma
Add support for discovery params class
Depend on latest kafo and curl

We need it because of foreman_discovery plugin installation
Use commited apache fix instead of our fork
Allow releasing from a x.y-stable branch
Changing foreman api installer dependency
Add foreman::cli class by default
refs #5793 - add pkg:generate_source rake task to create tar.bz2
refs #5987 - remove unused packaging files
Change xinetd to use Forge version 1.3.0
refs #3272 - print new user/password after installation
Add --detailed-exitcodes arg
fixes #4454 - switch PostgreSQL module to latest for EL7 support
Use our postgresql fork with F19 fix