Fix example usage

vadi2 · peterjgrainger · commit 3dcd834705de · 2020-03-10T09:33:34.000Z
The sample instructions didn't work for me - had to pass the github token explicitly.
diff --git a/README.md b/README.md
@@ -12,6 +12,8 @@ This action creates a new branch with the same commit reference as the branch it
 
 ```
 uses: peterjgrainger/action-create-branch@v1.0.0
+env: 
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 with:
   branch: 'release-notes'
 ```

-Original file line number
+Diff line change
 ```
 uses: peterjgrainger/[email protected]
 +env:
 +  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 with:
   branch: 'release-notes'
 ```