Add line breaks

visualize-git.md

@@ -18,13 +18,13 @@ git commit -m "message 7" <br/>
 git commit -m "message 8" <br/>
 
 ### Merging with master
-git checkout master
-git merge feature 
+git checkout master <br/>
+git merge feature  <br/>
 
 undo
 
 ### Rebase with master
-git checkout master
-git rebase feature
-git checkout feature
-git merge
+git checkout master <br/>
+git rebase feature <br/>
+git checkout feature <br/>
+git merge <br/>