```
net-im/py-slixmpp: Update to 1.4.2
This release contains a fix for CVE-2019-1000021.
Changelog:
https://lab.louiz.org/poezio/slixmpp/tags/slix-1.4.2
Security: 526d9642-3ae7-11e9-a669-8c164582fbac
Security: CVE-2019-1000021
MFH: 2019Q1
```
- I am not sure if I'm handling this vulnerability correctly.