Update 2018-03-13-african_task-force.md
Update 2018-03-13-african_task-force.md

adding links to TF page
swcarpentry/website,swcarpentry/website,ErinBecker/website,ErinBecker/website,ErinBecker/website,swcarpentry/website,swcarpentry/website,ErinBecker/website,ErinBecker/website,swcarpentry/website