Add stash of unstaged changes to tracked files

Author: Diogo Lemos

README.md

@@ -49,6 +49,7 @@ P.S: All these commands are tested on `git version 2.7.4 (Apple Git-66)`.
 * [Find out branches containing commit-hash](#find-out-branches-containing-commit-hash)
 * [Git Aliases](#git-aliases)
 * [Saving current state of tracked files without commiting](#saving-current-state-of-tracked-files-without-commiting)
+* [Saving current state of unstaged changes to tracked files](#saving-current-state-of-unstaged-changes-to-tracked-files)
 * [Saving current state including untracked files](#saving-current-state-including-untracked-files)
 * [Saving current state with message](#saving-current-state-with-message)
 * [Show list of all saved stashes](#show-list-of-all-saved-stashes)
@@ -406,6 +407,22 @@ __Alternatives:__
 git stash save
 ```
 
+## Saving current state of unstaged changes to tracked files
+```sh
+git stash -k
+```
+
+
+__Alternatives:__
+```sh
+git stash --keep-index
+```
+
+
+```sh
+git stash save --keep-index
+```
+
 ## Saving current state including untracked files
 ```sh
 git stash save -u