Added the gsD alias - show stash diff

This is a simple alias addition (with readme update) to show
a diff for each item in the stash

modules/git/README.md

@@ -170,6 +170,7 @@ Aliases
   - `gsx` drops a stashed state.
   - `gsX` drops all the stashed states.
   - `gsd` lists dropped stashed states.
+  - `gsD` shows the diff for all stashes
   - `gsl` lists stashed states.
   - `gsL` displays the changes recorded in the stash as a diff between the
     stashed state and its original parent.

modules/git/alias.zsh

@@ -155,6 +155,7 @@ alias gsr='git-stash-recover'
 alias gss='git stash save --include-untracked'
 alias gsS='git stash save --patch --no-keep-index'
 alias gsw='git stash save --include-untracked --keep-index'
+alias gsD='git show $(git stash list | cut -d":" -f 1)'
 
 # Submodule (S)
 alias gS='git submodule'