Fix for zsh (#10)

README.md

@@ -11,7 +11,7 @@ This is useful if you work on a project that squashes branches into master. Afte
 To run as a shellscript, simply copy the following command (setting up an alias is recommended). There's no need to clone the repo.
 
 ```bash
-git checkout -q master && git for-each-ref refs/heads/ "--format=%(refname:short)" | while read branch; do mergeBase=$(git merge-base master $branch) && [[ $(git cherry master $(git commit-tree $(git rev-parse $branch^{tree}) -p $mergeBase -m _)) == "-"* ]] && git branch -D $branch; done
+git checkout -q master && git for-each-ref refs/heads/ "--format=%(refname:short)" | while read branch; do mergeBase=$(git merge-base master $branch) && [[ $(git cherry master $(git commit-tree $(git rev-parse $branch\^{tree}) -p $mergeBase -m _)) == "-"* ]] && git branch -D $branch; done
 ```
 
 ### Node.js