Add parent alias to git

.gitconfig_includes.common

@@ -11,6 +11,7 @@
 pager = cat
 [alias]
 tree = log --show-signature --color --decorate --date=short --all --graph -n 3
+parent = log --pretty=%P -n 1
 newbranch = !git checkout master && git fetch -p && git reset --hard origin/master && git checkout -b "$2"
 head = log HEAD -n1
 signedcommit = !git commit -S