update readme for v3 (#708)v3.0.0

* update readme for v3

* update readme with changes

* nit grammar

1 files changed, 16 insertions, 29 deletions

diff --git a/README.md b/README.md
index 775cee5..b185d46 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
   <a href="https://github.com/actions/checkout"><img alt="GitHub Actions status" src="https://github.com/actions/checkout/workflows/test-local/badge.svg"></a>
 </p>
 
-# Checkout V2
+# Checkout V3
 
 This action checks-out your repository under `$GITHUB_WORKSPACE`, so your workflow can access it.
 
@@ -14,27 +14,14 @@ When Git 2.18 or higher is not in your PATH, falls back to the REST API to downl
 
 # What's new
 
-- Improved performance
-  - Fetches only a single commit by default
-- Script authenticated git commands
-  - Auth token persisted in the local git config
-- Supports SSH
-- Creates a local branch
-  - No longer detached HEAD when checking out a branch
-- Improved layout
-  - The input `path` is always relative to $GITHUB_WORKSPACE
-  - Aligns better with container actions, where $GITHUB_WORKSPACE gets mapped in
-- Fallback to REST API download
-  - When Git 2.18 or higher is not in the PATH, the REST API will be used to download the files
-  - When using a job container, the container's PATH is used
-
-Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous versions.
+- Updated to the node16 runtime by default
+  - This requires a minimum [Actions Runner](https://github.com/actions/runner/releases/tag/v2.285.0) version of v2.285.0 to run, which is by default available in GHES 3.4 or later.
 
 # Usage
 
 <!-- start usage -->
 ```yaml
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
   with:
     # Repository name with owner. For example, actions/checkout
     # Default: ${{ github.repository }}
@@ -123,7 +110,7 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
 ## Fetch all history for all tags and branches
 
 ```yaml
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
   with:
     fetch-depth: 0
 ```
@@ -131,7 +118,7 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
 ## Checkout a different branch
 
 ```yaml
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
   with:
     ref: my-branch
 ```
@@ -139,7 +126,7 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
 ## Checkout HEAD^
 
 ```yaml
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
   with:
     fetch-depth: 2
 - run: git checkout HEAD^
@@ -149,12 +136,12 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
 
 ```yaml
 - name: Checkout
-  uses: actions/checkout@v2
+  uses: actions/checkout@v3
   with:
     path: main
 
 - name: Checkout tools repo
-  uses: actions/checkout@v2
+  uses: actions/checkout@v3
   with:
     repository: my-org/my-tools
     path: my-tools
@@ -164,10 +151,10 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
 
 ```yaml
 - name: Checkout
-  uses: actions/checkout@v2
+  uses: actions/checkout@v3
 
 - name: Checkout tools repo
-  uses: actions/checkout@v2
+  uses: actions/checkout@v3
   with:
     repository: my-org/my-tools
     path: my-tools
@@ -177,12 +164,12 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
 
 ```yaml
 - name: Checkout
-  uses: actions/checkout@v2
+  uses: actions/checkout@v3
   with:
     path: main
 
 - name: Checkout private tools
-  uses: actions/checkout@v2
+  uses: actions/checkout@v3
   with:
     repository: my-org/my-private-tools
     token: ${{ secrets.GH_PAT }} # `GH_PAT` is a secret that contains your PAT
@@ -195,7 +182,7 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
 ## Checkout pull request HEAD commit instead of merge commit
 
 ```yaml
-- uses: actions/checkout@v2
+- uses: actions/checkout@v3
   with:
     ref: ${{ github.event.pull_request.head.sha }}
 ```
@@ -211,7 +198,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 ```
 
 ## Push a commit using the built-in token
@@ -222,7 +209,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - run: |
           date > generated.txt
           git config user.name github-actions