doc: updated contributors file

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: bot-go-openapi[bot]

CONTRIBUTORS.md

@@ -0,0 +1,21 @@
+# Contributors
+
+- Repository: ['go-openapi/jsonreference']
+
+| Total Contributors | Total Contributions |
+| --- | --- |
+| 9  | 68  |
+
+| Username | All Time Contribution Count | All Commits |
+| --- | --- | --- |
+| @fredbi | 31 | https://github.com/go-openapi/jsonreference/commits?author=fredbi |
+| @casualjim | 25 | https://github.com/go-openapi/jsonreference/commits?author=casualjim |
+| @youyuanwu | 5 | https://github.com/go-openapi/jsonreference/commits?author=youyuanwu |
+| @olivierlemasle | 2 | https://github.com/go-openapi/jsonreference/commits?author=olivierlemasle |
+| @apelisse | 1 | https://github.com/go-openapi/jsonreference/commits?author=apelisse |
+| @gbjk | 1 | https://github.com/go-openapi/jsonreference/commits?author=gbjk |
+| @honza | 1 | https://github.com/go-openapi/jsonreference/commits?author=honza |
+| @Neo2308 | 1 | https://github.com/go-openapi/jsonreference/commits?author=Neo2308 |
+| @erraggy | 1 | https://github.com/go-openapi/jsonreference/commits?author=erraggy |
+
+ _this file was generated by the [Contributors GitHub Action](https://github.com/github/contributors)_