Fixed printing to ~/.gitconfig

dotfiles/git-universe/setup

 host=`hostname`
 user=`whoami`
 
-conf=""
-conf="${conf}[include]\n"
-conf="${conf}    path = $tilde/.git-universe/gitconfig-before\n"
-conf="${conf}    path = $tilde/.git-universe/host/$host.gitconfig\n"
-conf="${conf}    path = $tilde/.git-universe/user/$user.gitconfig\n"
-conf="${conf}    path = $tilde/.git-universe/gitconfig-after\n"
-
-echo $conf >> ~/.gitconfig
-
+printf "[include]\n" >> ~/.gitconfig
+printf "    path = $tilde/.git-universe/gitconfig-before\n" >> ~/.gitconfig
+printf "    path = $tilde/.git-universe/host/$host.gitconfig\n" >> ~/.gitconfig
+printf "    path = $tilde/.git-universe/user/$user.gitconfig\n" >> ~/.gitconfig
+printf "    path = $tilde/.git-universe/gitconfig-after\n" >> ~/.gitconfig