v2.0.0

BC breaks

• #6 Update services according to Symfony best practices.
  Services should not use autowiring or autoconfiguration. Instead, all services should be defined explicitly.
  Services must be prefixed with the bundle alias instead of using fully qualified class names => cleverage_doctrine_process
• #5 Bump "doctrine/doctrine-bundle": "^2.5" according to Symfony versions supported by cleverage/process-bundle
• #4 Allow installing "doctrine/orm": ^3.0 using at least require "doctrine/orm": "^2.9 || ^3.0".
  Forbid "doctrine/dbal" 4 for now (as on "symfony/orm-pack" - symfony/orm-pack@266bae0#diff-d2ab9925cad7eac58e0ff4cc0d251a937ecf49e4b6bf57f8b95aab76648a9d34R7 ) using "doctrine/dbal": "^2.9 || ^3.0".
  Add "doctrine/common": "^3.0" and "doctrine/doctrine-migrations-bundle": "^3.2"
• #4 Remove DoctrineWriterTask option global_flush
  due to removing partially flush ability on doctrine/orm 3.*
• #12 Remove PurgeDoctrineCacheTask

Changes

• #3 Add Makefile & .docker for local standalone usage
• #3 Add rector, phpstan & php-cs-fixer configurations & apply it