modify the brew template for knitr
modify the brew template for knitr

fboehm/cboettig_site,fboehm/labnotebook,fboehm/labnotebook,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/cboettig_site,fboehm/cboettig_site,antass/labnotebook3,fboehm/labnotebook,fboehm/labnotebook,antass/labnotebook3,fboehm/cboettig_site,antass/labnotebook3