Json-server-py

* Fix `line-break` error in CLI

* Add `--foreignKeySuffix` option (e.g. snake case `post_id`) [556](https://github.com/typicode/json-server/pull/556) [#570](https://github.com/typicode/json-server/pull/570)

* Multiple fields sorting `GET /posts?_sort=user,views&_order=desc,asc`

* __Drop Node `v0.12` support__
* Prevent `TypeError` when a filter is applied on a `null` value [510](https://github.com/typicode/json-server/issues/510)

* Update index page
* Improve performances ([lowdb](https://github.com/typicode/lowdb) `v0.15`)
* Add `Location` header to newly created resources [473](https://github.com/typicode/json-server/pull/473)

* Display custom routes on homepage
* Fix duplicate query params error [352](https://github.com/typicode/json-server/issues/352)