Remove unnecessary whitespace from client-hg.asc

Author: crd

book/09-git-and-other-scms/sections/client-hg.asc

@@ -137,7 +137,6 @@ $ cp .hgignore .git/info/exclude
 
 The `.git/info/exclude` file acts just like a `.gitignore`, but isn't included in commits.
 
-
 ===== Workflow
 
 Let's assume we've done some work and made some commits on the `master` branch, and you're ready to push it to the remote repository.