fix attribute "font" to support library 26.1.0
fix attribute "font" to support library 26.1.0

codetoart/FolioReader-Android,FolioReader/FolioReader-Android,FolioReader/FolioReader-Android,FolioReader/FolioReader-Android,codetoart/FolioReader-Android,codetoart/FolioReader-Android