md2img

#wkhtmltopdf install
##Mac install
brew cask install wkhtmltopdf
##centos install

wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox-0.12.5-1.centos7.x86_64.rpm. 
rpm -ivh wkhtmltox-0.12.5-1.centos7.x86_64.rpm. 
yun install -y fontconfig libX11 libXext xorg-x11-fonts-75dpi xorg-x11-fonts-Type1 urw-fonts libXext openssl-devel.