Bump lxml from 4.4.1 to 4.6.2

Bumps [lxml](https://github.com/lxml/lxml) from 4.4.1 to 4.6.2.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.4.1...lxml-4.6.2)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,5 +1,5 @@
 requests==2.22.0
-lxml==4.4.1
+lxml==4.6.2
 colorama==0.4.1
 beautifulsoup4==4.9.3
 selenium==3.141.0