Updated calibre package fixes security vulnerability:
gui2/viewer/bookmarkmanager.py in Calibre 3.18 calls cPickle.load on imported bookmark data, which allows remote attackers to execute arbitrary code via a crafted .pickle file, as demonstrated by Python code that contains an os.system call (CVE-2018-7889).
The python-html5-parser package is a new dependency for the updated calibre package and has been included with this update.