Apply suggestions from code review

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>

README.md

@@ -33,16 +33,16 @@ Options:
 ## About
 
 This tool is used to backport CPython changes from `main` into one or more
-of the maintenance branches (`3.6`, `3.5`, `2.7`).
+of the maintenance branches (e.g. `3.12`, `3.11`).
 
 `cherry_picker` can be configured to backport other projects with similar
 workflow as CPython. See the configuration file options below for more details.
 
-The maintenance branch names should contain some sort of version number (X.Y).
-For example: `3.6`, `3.5`, `2.7`, `stable-2.6`, `2.5-lts`, are all
-supported branch names.
+The maintenance branch names should contain some sort of version number (`X.Y`).
+For example: `3.12`, `stable-3.12`, `1.5`, `1.5-lts`, are all supported branch
+names.
 
-It will prefix the commit message with the branch, e.g. `[3.6]`, and then
+It will prefix the commit message with the branch, e.g. `[3.12]`, and then
 open up the pull request page.
 
 Write tests using [pytest](https://docs.pytest.org/).
@@ -200,29 +200,29 @@ To customize the tool for used by other project:
 ### Example
 
 For example, to cherry-pick `6de2b7817f-some-commit-sha1-d064` into
-`3.5` and `3.6`, run the following command from the cloned CPython
+`3.12` and `3.11`, run the following command from the cloned CPython
 directory:
 
 ```console
-(venv) $ cherry_picker 6de2b7817f-some-commit-sha1-d064 3.5 3.6
+(venv) $ cherry_picker 6de2b7817f-some-commit-sha1-d064 3.12 3.11
 ```
 
 What this will do:
 
 ```console
 (venv) $ git fetch upstream
 
-(venv) $ git checkout -b backport-6de2b78-3.5 upstream/3.5
+(venv) $ git checkout -b backport-6de2b78-3.12 upstream/3.12
 (venv) $ git cherry-pick -x 6de2b7817f-some-commit-sha1-d064
-(venv) $ git push origin backport-6de2b78-3.5
+(venv) $ git push origin backport-6de2b78-3.12
 (venv) $ git checkout main
-(venv) $ git branch -D backport-6de2b78-3.5
+(venv) $ git branch -D backport-6de2b78-3.12
 
-(venv) $ git checkout -b backport-6de2b78-3.6 upstream/3.6
+(venv) $ git checkout -b backport-6de2b78-3.11 upstream/3.11
 (venv) $ git cherry-pick -x 6de2b7817f-some-commit-sha1-d064
-(venv) $ git push origin backport-6de2b78-3.6
+(venv) $ git push origin backport-6de2b78-3.11
 (venv) $ git checkout main
-(venv) $ git branch -D backport-6de2b78-3.6
+(venv) $ git branch -D backport-6de2b78-3.11
 ```
 
 In case of merge conflicts or errors, the following message will be displayed:
@@ -245,24 +245,24 @@ Passing the `--dry-run` option will cause the script to print out all the
 steps it would execute without actually executing any of them. For example:
 
 ```console
-$ cherry_picker --dry-run --pr-remote pr 1e32a1be4a1705e34011770026cb64ada2d340b5 3.6 3.5
+$ cherry_picker --dry-run --pr-remote pr 1e32a1be4a1705e34011770026cb64ada2d340b5 3.12 3.11
 Dry run requested, listing expected command sequence
 fetching upstream ...
 dry_run: git fetch origin
-Now backporting '1e32a1be4a1705e34011770026cb64ada2d340b5' into '3.6'
-dry_run: git checkout -b backport-1e32a1b-3.6 origin/3.6
+Now backporting '1e32a1be4a1705e34011770026cb64ada2d340b5' into '3.12'
+dry_run: git checkout -b backport-1e32a1b-3.12 origin/3.12
 dry_run: git cherry-pick -x 1e32a1be4a1705e34011770026cb64ada2d340b5
-dry_run: git push pr backport-1e32a1b-3.6
-dry_run: Create new PR: https://github.com/python/cpython/compare/3.6...ncoghlan:backport-1e32a1b-3.6?expand=1
+dry_run: git push pr backport-1e32a1b-3.12
+dry_run: Create new PR: https://github.com/python/cpython/compare/3.12...ncoghlan:backport-1e32a1b-3.12?expand=1
 dry_run: git checkout main
-dry_run: git branch -D backport-1e32a1b-3.6
-Now backporting '1e32a1be4a1705e34011770026cb64ada2d340b5' into '3.5'
-dry_run: git checkout -b backport-1e32a1b-3.5 origin/3.5
+dry_run: git branch -D backport-1e32a1b-3.12
+Now backporting '1e32a1be4a1705e34011770026cb64ada2d340b5' into '3.11'
+dry_run: git checkout -b backport-1e32a1b-3.11 origin/3.11
 dry_run: git cherry-pick -x 1e32a1be4a1705e34011770026cb64ada2d340b5
-dry_run: git push pr backport-1e32a1b-3.5
-dry_run: Create new PR: https://github.com/python/cpython/compare/3.5...ncoghlan:backport-1e32a1b-3.5?expand=1
+dry_run: git push pr backport-1e32a1b-3.11
+dry_run: Create new PR: https://github.com/python/cpython/compare/3.11...ncoghlan:backport-1e32a1b-3.11?expand=1
 dry_run: git checkout main
-dry_run: git branch -D backport-1e32a1b-3.5
+dry_run: git branch -D backport-1e32a1b-3.11
 ```
 
 ### `--pr-remote` option
@@ -321,7 +321,7 @@ tab that points to the pull request creation page.
 The url of the pull request page looks similar to the following:
 
 ```
-https://github.com/python/cpython/compare/3.5...<username>:backport-6de2b78-3.5?expand=1
+https://github.com/python/cpython/compare/3.12...<username>:backport-6de2b78-3.12?expand=1
 ```
 
 Press the `Create Pull Request` button.