v1.6.0 release

What's Changed

• fix: SearchKeys with optional count and add SearchKeys Async for IRed… by @catcherwong in #355
• fix: csredis key prefix issue(#356) by @catcherwong in #358
• optimization: more clear exception message for not found by @catcherwong in #362
• Improve memcached operation when can not create connection by @catcherwong in #364
• Upgrade dependencies by @catcherwong in #365
• feat: redis feature support ZRangeByScore by @catcherwong in #366
• v1.6.0 by @catcherwong in #368

Full Changelog: v1.5.1...v1.6.0