revert readme changes

README.md

@@ -1,4 +1,4 @@
-# setup-python v4
+# setup-python V3
 
 <p align="left">
   <a href="https://github.com/actions/setup-python"><img alt="GitHub Actions status" src="https://github.com/actions/setup-python/workflows/Main%20workflow/badge.svg"></a>
@@ -20,7 +20,6 @@ This action sets up a Python environment for use in actions by:
 - Support for pre-release versions of Python.
 - Support for installing any version of PyPy on-flight
 - Support for built-in caching of pip, pipenv and poetry dependencies
-- Support for `.python-version` file
 
 # Usage
 
@@ -30,24 +29,13 @@ Basic:
 ```yaml
 steps:
 - uses: actions/checkout@v3
-- uses: actions/setup-python@v4
+- uses: actions/setup-python@v3
   with:
     python-version: '3.x' # Version range or exact version of a Python version to use, using SemVer's version range syntax
     architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
 - run: python my_script.py
 ```
 
-Read Python version from file:
-```yaml
-steps:
-- uses: actions/checkout@v3
-- uses: actions/setup-python@v4
-  with:
-    python-version-file: '.python-version' # Read python version from a file
-    architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
-- run: python my_script.py
-```
-
 Matrix Testing:
 ```yaml
 jobs:
@@ -60,7 +48,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python-version }}
           architecture: x64
@@ -84,7 +72,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python-version }}
       - name: Display Python version
@@ -102,7 +90,7 @@ jobs:
         python-version: ['3.7.4', '3.8', '3.9', '3.10']
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python-version }}
     - run: python my_script.py
@@ -112,7 +100,7 @@ Download and set up an accurate pre-release version of Python:
 ```yaml
 steps:
 - uses: actions/checkout@v3
-- uses: actions/setup-python@v4
+- uses: actions/setup-python@v3
   with:
     python-version: '3.11.0-alpha.1'
 - run: python my_script.py
@@ -122,7 +110,7 @@ Download and set up the latest available version of Python (includes both pre-re
 ```yaml
 steps:
 - uses: actions/checkout@v3
-- uses: actions/setup-python@v4
+- uses: actions/setup-python@v3
   with:
     python-version: '3.11.0-alpha - 3.11.0' # SemVer's version range syntax
 - run: python my_script.py
@@ -142,7 +130,7 @@ jobs:
         - 'pypy3.8' # the latest available version of PyPy that supports Python 3.8
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python-version }}
     - run: python my_script.py
@@ -241,7 +229,7 @@ The requirements file format allows to specify dependency versions using logical
 ```yaml
 steps:
 - uses: actions/checkout@v3
-- uses: actions/setup-python@v4
+- uses: actions/setup-python@v3
   with:
     python-version: '3.9'
     cache: 'pip'
@@ -254,7 +242,7 @@ steps:
 - uses: actions/checkout@v3
 - name: Install pipenv
   run: pipx install pipenv
-- uses: actions/setup-python@v4
+- uses: actions/setup-python@v3
   with:
     python-version: '3.9'
     cache: 'pipenv'
@@ -267,7 +255,7 @@ steps:
 - uses: actions/checkout@v3
 - name: Install poetry
   run: pipx install poetry
-- uses: actions/setup-python@v4
+- uses: actions/setup-python@v3
   with:
     python-version: '3.9'
     cache: 'poetry'
@@ -279,7 +267,7 @@ steps:
 ```yaml
 steps:
 - uses: actions/checkout@v3
-- uses: actions/setup-python@v4
+- uses: actions/setup-python@v3
   with:
     python-version: '3.9'
     cache: 'pip'
@@ -293,7 +281,7 @@ steps:
 - uses: actions/checkout@v3
 - name: Install pipenv
   run: pipx install pipenv
-- uses: actions/setup-python@v4
+- uses: actions/setup-python@v3
   with:
     python-version: '3.9'
     cache: 'pipenv'