- [2183: (dev) Fixed README badges on 3.x](https://github.com/slimphp/Slim/pull/2183)
- [2186: (dev) Fix travis for 3.x branch](https://github.com/slimphp/Slim/pull/2186)
- [2187: Allow all HTTP valid methods on 3.x](https://github.com/slimphp/Slim/pull/2187)
- [2213: ipv6 address without port generates warning](https://github.com/slimphp/Slim/pull/2213)
- [2216: determineAuthorization(): HTTP_AUTHORIZATION may be null or an empty string](https://github.com/slimphp/Slim/pull/2216)
- [2244: Adding plain not found response for OPTIONS requests](https://github.com/slimphp/Slim/pull/2244)
- [2250: Add `only` restriction to getParams()](https://github.com/slimphp/Slim/pull/2250)
- [2270: Error handlers should respect `outputBuffering` setting](https://github.com/slimphp/Slim/pull/2270)
- [2273: Add setOutputBuffering() to RouteInterface](https://github.com/slimphp/Slim/pull/2273)
- [2283: (dev) Fix typos in variable names](https://github.com/slimphp/Slim/pull/2283)
- [2286: Track only the stack tip in MiddlewareAwareTrait](https://github.com/slimphp/Slim/pull/2286)
- [2287: Make OPTIONS rendering clearer](https://github.com/slimphp/Slim/pull/2287)
- [2292: (dev) Fix typo in comment](https://github.com/slimphp/Slim/pull/2292)
- [2298: Support HTTP "2" as a valid protocol version (i.e no minor version)](https://github.com/slimphp/Slim/pull/2298)
- [2302: Pass $app to group() so invokable classes can be used](https://github.com/slimphp/Slim/pull/2302)
- [2309: Send correct status code regardless of location header](https://github.com/slimphp/Slim/pull/2309)
- [2323: Add 443 as SERVER_PORT(default) when request is https](https://github.com/slimphp/Slim/pull/2323)
- [2327: Encode user info](https://github.com/slimphp/Slim/pull/2327)