Invalid github feature template

[peldszus]

Describe the bug

There is a github issue feature template, but it is not offered as a possible choice when creating a new issue.

The reason is that the yaml is not valid.

Steps to reproduce

• Click on new issue.

PJSIP version

master

Notes

This issue exists since a year when the template was last changed.

https://github.com/pjsip/pjproject/blob/c7f30633731e655e5c94398186744f2ca6ba8664/.github/ISSUE_TEMPLATE/feature_request.yml