Use current versions in README (#21)

Upgrading to latest released versions of actions in README

Author: npwolf

README.md

@@ -24,9 +24,9 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2
-    - uses: cloudposse/github-action-pre-commit@v2.1.2
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+    - uses: cloudposse/github-action-pre-commit@v4.0.0
 ```
 
 This does a few things:
@@ -44,7 +44,7 @@ Here's a sample step configuration that only runs the `flake8` hook against all
 the files (use the template above except for the `pre-commit` action):
 
 ```yaml
-    - uses: cloudposse/github-action-pre-commit@v2.1.2
+    - uses: cloudposse/github-action-pre-commit@v4.0.0
       with:
         extra_args: flake8 --all-files
 ```
@@ -69,7 +69,7 @@ pushing
 next is passing the token to the pre-commit action
 
 ```yaml
-    - uses: cloudposse/github-action-pre-commit@v2.1.2
+    - uses: cloudposse/github-action-pre-commit@v4.0.0
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
         git_user_name: pre-commit