update readme

[ci skip]
require newer temple
v2.0.0.pre.9
remove unnecessary regex
simplify parser
simpler modifier parsing
implement option 3 (#375)
fix
update readme
update readme
test against tilt 1.3.4 because of asciidoctor
fix rails tests
fix tests
fix dependency
fix for newest tilt
require newer minitest
use separate tilt mapping for slim
fixes by @raxoft
run with minitest 4
fix travis.yml