bintray: fix filename for bottle uploads
bintray: fix filename for bottle uploads

nandub/brew,MikeMcQuaid/brew,JCount/brew,Homebrew/brew,nandub/brew,JCount/brew,nandub/brew,EricFromCanada/brew,EricFromCanada/brew,MikeMcQuaid/brew,EricFromCanada/brew,MikeMcQuaid/brew,claui/brew,Homebrew/brew,claui/brew,Homebrew/brew,JCount/brew,MikeMcQuaid/brew,JCount/brew,claui/brew,EricFromCanada/brew,nandub/brew,claui/brew,Homebrew/brew