Bump lxml from 4.3.4 to 4.6.3 (#357)

Bumps [lxml](https://github.com/lxml/lxml) from 4.3.4 to 4.6.3.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.3.4...lxml-4.6.3)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -12,7 +12,7 @@ geopy==1.20.0
 googletrans==3.0.0
 jellyfish==0.7.1
 luigi==2.8.6
-lxml==4.3.4
+lxml==4.6.3
 matplotlib==3.1.1
 mock==3.0.5
 mysql_connector_repackaged==0.3.1