Enhancement

• Implement RFC-1014, add task_enable_coroutine, remove task_async (13ab0f8)
• Support gethostbyname timeout, add async task thread pool (#2256)
• Co\PostgreSQL supports process-oriented prepare (#2223) (#2258)
• Co\Redis client adds getOptions method (#2279)

Fixed

• Fixed non-coroutine after server reload (#2262) (3ac2337)
• Fixed wrong data in Table (#2263) (872e99d)
• Fixed Co\Http\Client:addFile error when optional parameter is null (#2270)
• Fixed optional parameter problem for Co::getaddrinfo (#2273)
• Fixed timers in user processes (#2274)
• Fixed the availability of gdb debugging tools in C++ (90d148b) (b12f62f)