Fixes #1176
Fixes #1176

Changed broken Docker Linux installation link in README.md.
flodolo/testpilot,chuckharmston/testpilot,lmorchard/idea-town-server,ckprice/testpilot,6a68/testpilot,flodolo/testpilot,lmorchard/idea-town-server,dannycoates/testpilot,lmorchard/idea-town,meandavejustice/testpilot,ckprice/testpilot,mozilla/testpilot,lmorchard/idea-town-server,dannycoates/testpilot,6a68/testpilot,6a68/idea-town,mathjazz/testpilot,6a68/testpilot,mozilla/idea-town-server,mathjazz/testpilot,meandavejustice/testpilot,mozilla/testpilot,mozilla/idea-town-server,chuckharmston/testpilot,clouserw/testpilot,lmorchard/testpilot,lmorchard/idea-town,fzzzy/testpilot,ckprice/testpilot,lmorchard/idea-town,chuckharmston/testpilot,mozilla/testpilot,6a68/testpilot,lmorchard/testpilot,fzzzy/testpilot,mozilla/testpilot,lmorchard/testpilot,meandavejustice/testpilot,flodolo/testpilot,mozilla/idea-town,mathjazz/testpilot,clouserw/testpilot,6a68/idea-town,ckprice/testpilot,clouserw/testpilot,clouserw/testpilot,fzzzy/testpilot,dannycoates/testpilot,fzzzy/testpilot,dannycoates/testpilot,mozilla/idea-town,lmorchard/idea-town,chuckharmston/testpilot,mozilla/idea-town,mozilla/idea-town-server,meandavejustice/testpilot,mozilla/idea-town-server,mozilla/idea-town,6a68/idea-town,6a68/idea-town,lmorchard/testpilot,flodolo/testpilot,lmorchard/idea-town-server,mathjazz/testpilot