Add a tip for automatically stashing changes before a rebase

Signed-off-by: Eric James Michael Ritz <ejmr@plutono.com>

Author: Eric James Michael Ritz

README.md

@@ -64,6 +64,7 @@
 * [Import from a bundle](https://github.com/git-tips/tips#import-from-a-bundle)
 * [Get the name of current branch.](https://github.com/git-tips/tips#get-the-name-of-current-branch)
 * [Ignore one file on commit (e.g. Changelog).](https://github.com/git-tips/tips#ignore-one-file-on-commit-eg-changelog)
+* [Stash changes before rebasing](https://github.com/git-tips/tips#stash-changes-before-rebasing)
 
 <!-- Don’t remove or change the comment below – that can break automatic updates. More info at <http://npm.im/doxie.inject>. -->
 <!-- @doxie.inject end toc -->
@@ -449,5 +450,10 @@ git rev-parse --abbrev-ref HEAD
 git update-index --assume-unchanged Changelog; git commit -a; git update-index --no-assume-unchanged Changelog
 ```
 
+## Stash changes before rebasing
+```sh
+git rebase --autostash
+```
+
 <!-- Don’t remove or change the comment below – that can break automatic updates. More info at <http://npm.im/doxie.inject>. -->
 <!-- @doxie.inject end -->

tips.json

@@ -255,5 +255,9 @@
   {
     "title": "Ignore one file on commit (e.g. Changelog).",
     "tip": "git update-index --assume-unchanged Changelog; git commit -a; git update-index --no-assume-unchanged Changelog"
+  },
+  {
+    "title": "Stash changes before rebasing",
+    "tip": "git rebase --autostash"
   }
 ]