Split long line in gitconfig for readability

dotfiles/git-universe/before.gitconfig

@@ -10,7 +10,8 @@
   co = checkout
   com = checkout master
   dc = !clear && git diff --cached
-  gr = log --graph --full-history --all --color --pretty=tformat:"%x1b[31m%h%x09%x1b[32m%d%x1b[0m%x20%s%x1b[0m"
+  gr = log --graph --full-history --all --color\
+       --pretty=tformat:"%x1b[31m%h%x09%x1b[32m%d%x1b[0m%x20%s%x1b[0m"
   rb = rebase
   rbi = rebase --interactive
   rmv = remote --verbose