Added note about testing on 1.8 and 1.9.
Added note about testing on 1.8 and 1.9.

[ci skip]

haml/haml,nazar-pc/haml,keithpitty/haml,macressler/haml,tangposmarvin/haml,tangposmarvin/haml,dg1dd1ngs/haml,macressler/haml,dg1dd1ngs/haml,keithpitty/haml,haml/haml,stanhu/haml,stanhu/haml,amatsuda/haml,nazar-pc/haml,haml/haml,sideci-sample/sideci-sample-haml,haml/haml