Yii2 extensions with pending releases were tagged:

• Composer 2.0.11
• Redis 2.0.19
• Shell 2.0.6
• apidoc 3.0.7
• HTTP client 2.0.16
• bootstrap4 2.0.12
• Gii 2.2.7
• Elasticsearch 2.1.5
• MongoDB 3.0.2
• Debug 2.1.26
• Twig 2.5.1
• Auth Client 2.2.17

Follow the links above to check individual changelogs. Big thanks to Yii community for pull requests.