v2.0.6

🔥 New

• Add CacheControl option for favicon middleware #883

🧹 Updates

• Add long-poll to third-party middlewares #868
• Add unit tests for cache middleware #880
• Add unit tests for ctx #876
• Add unit tests for app #875

🩹 Fixes

• Fix a missing cookie name when not provided in csrf config #872
• Fix app mounting on group structs #877
• Fix lint warnings and remove dead code #879
• Fix duplicated licenses from readme #878