Merge pull request #295 from axmbo/patch-1

Example doesn't work on Windows 7.

Author: ben

book/02-git-basics/sections/aliases.asc

@@ -66,5 +66,5 @@ We can demonstrate by aliasing `git visual` to run `gitk`:
 
 [source,console]
 ----
-$ git config --global alias.visual "!gitk"
+$ git config --global alias.visual '!gitk'
 ----