update documentation with instagram_username option
update documentation with instagram_username option

IronSummitMedia/startbootstrap-clean-blog-jekyll,guydavis/guydavis.github.io,ceduliocezar/ceduliocezar.github.io,ceduliocezar/ceduliocezar.github.io,IronSummitMedia/startbootstrap-clean-blog-jekyll,BlackrockDigital/startbootstrap-clean-blog-jekyll,guydavis/guydavis.github.io,IronSummitMedia/startbootstrap-clean-blog-jekyll,ceduliocezar/ceduliocezar.github.io,guydavis/guydavis.github.io,guydavis/guydavis.github.io,ceduliocezar/ceduliocezar.github.io,BlackrockDigital/startbootstrap-clean-blog-jekyll,BlackrockDigital/startbootstrap-clean-blog-jekyll,IronSummitMedia/startbootstrap-clean-blog-jekyll