Set textwidth to 72 in org-mode

vimrc

@@ -88,6 +88,7 @@ if has("eval")
     let g:netrw_liststyle=3
     let g:netrw_sort_sequence='[\/]$,*'
     let g:netrw_winsize=-28
+    let g:org_tag_column=72
     " Disable vim-go warning on CentOS
     let g:go_version_warning = 0
     " Set colour levels for different terminals.