Uncommit command has been added

lib/git.zsh

@@ -155,6 +155,11 @@ function git_reset_branch_commits() {
     git reset $(git merge-base $1 $(git branch --show-current))
 }
 
+function git-uncommit() {
+    git reset --soft HEAD~1
+    git restore --staged .
+}
+
 #this is unlikely to change so make it all statically assigned
 POST_1_7_2_GIT=$(git_compare_version "1.7.2")
 #clean up the namespace slightly by removing the checker function