Fails with Python 3.8

[Wernichraats]

Using python 3.8 I get the following error:

AttributeError: module 'cgi' has no attribute 'escape'.

Using "html_escape" fixed the issue.

[arvindh-manian]

Related PR: #40

[AaronDMarasco]

Thanks for the hint @Wernichraats this is what I ended up doing:

# Work around simplekml #38
import cgi
import html
cgi.escape = html.escape