update travis-after-success.sh to avoid error on kramdown 2.0.0 with "-i GFM"
update travis-after-success.sh to avoid error on kramdown 2.0.0 with "-i GFM"

vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js