Meetup.com importer bugfix for 59edbf6769127c9ef533f276e0a8698d2bb34872
When getting all events for group we can request description in plain text, when getting single event we can only get HTML and must strip tags.
Merge branch 'v1.3.x' of github.com:OpenACalendar/OpenACalendar-Web-Core into v1.3.x