0.20.0

Merged

• [All] Allow DBAL 4 #169
• [All] Drop Symfony 5 #168
• [All] Solve some deprecations #167

Commits

• Drop Symfony 5 4ad7a8a
• Solve some deprecations c99d06a
• open 0.20-dev 8d5e10d
• fix rest of dbal 23c91eb
• avoid test with 5.4 92a9630
• Allow DBAL 4 2b86299
• add missing dependency 4c3add5
• configure php-cs-fixer parallel 0504b7b