Fix the since-version badge
Fix the since-version badge

hugovk/coveragepy,nedbat/coveragepy,blueyed/coveragepy,nedbat/coveragepy,blueyed/coveragepy,nedbat/coveragepy,hugovk/coveragepy,blueyed/coveragepy,hugovk/coveragepy,blueyed/coveragepy,hugovk/coveragepy,blueyed/coveragepy,nedbat/coveragepy,hugovk/coveragepy,nedbat/coveragepy