OMG you were right !!
I had it too and I can see Git repo also redirects to https://github.com/discourse/discourse-post-voting !! 
But wait… topic-voting AND q&a merged into post-voting ? Are features cumulated ?
So here is my latest plugin list :
hooks:
after_code:
- exec:
cd: $home/plugins
cmd:
- mkdir -p plugins
- git clone https://github.com/discourse/docker_manager.git
- git clone https://github.com/discourse/discourse-openid-connect
- git clone https://github.com/discourse/discourse-solved
- git clone https://github.com/discourse/discourse-yearly-review
- git clone https://github.com/discourse/discourse-checklist
- git clone https://github.com/discourse/discourse-docs
- git clone https://github.com/discourse/discourse-reactions
#- git clone https://github.com/discourse/discourse-feature-voting
- git clone https://github.com/discourse/discourse-calendar
#- git clone https://github.com/discourse/discourse-gamification
- git clone https://github.com/discourse/discourse-gamification && cd discourse-gamification && git checkout 6a399b4c220f31de62049504d27ff6e50611fbef
- git clone https://github.com/discourse/discourse-follow
- git clone https://github.com/discourse/discourse-spoiler-alert
- git clone https://github.com/paviliondev/discourse-news
- git clone https://github.com/cfstras/discourse-konami.git
#- git clone https://github.com/discourse/discourse-question-answer
- git clone https://github.com/discourse/discourse-post-voting
Discourse finally responds.
But now other problems :
- Plugin admin show “question & answer”…
- When I create a topic, the item menu is not good :
- Config in category settings always show q&a
So it seems q&a is always there…