[ci] Remove unused bintray file.
[ci] Remove unused bintray file.

Not needed anymore after Travis was removed.

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