Add a note about [ci skip] in CI README.
Add a note about [ci skip] in CI README.

Matafou/coq,coq/coq,silene/coq,SkySkimmer/coq,JasonGross/coq,gares/coq,ejgallego/coq,coq/coq,JasonGross/coq,Zimmi48/coq,Zimmi48/coq,JasonGross/coq,maximedenes/coq,Matafou/coq,gares/coq,maximedenes/coq,ppedrot/coq,SkySkimmer/coq,maximedenes/coq,JasonGross/coq,SkySkimmer/coq,ppedrot/coq,gares/coq,coq/coq,Zimmi48/coq,ppedrot/coq,SkySkimmer/coq,ppedrot/coq,ejgallego/coq,ppedrot/coq,gares/coq,Matafou/coq,silene/coq,silene/coq,coq/coq,maximedenes/coq,Zimmi48/coq,gares/coq,ejgallego/coq,ejgallego/coq,maximedenes/coq