Add download stats to README.md and reorganize shield icons
Add download stats to README.md and reorganize shield icons
w3c/epubcheck,mihailim/epubcheck,w3c/epubcheck,IDPF/epubcheck,IDPF/epubcheck,IDPF/epubcheck,w3c/epubcheck,mihailim/epubcheck,mihailim/epubcheck,mihailim/epubcheck,IDPF/epubcheck,IDPF/epubcheck,mihailim/epubcheck