Update hands-on practicals to use main (#182)

# Exercise Review

## Exercise Discussion

Fix #180 

## Checklist

- [ ] If you require a new remote repository on the `Git-Mastery`
organization, have you [created a
request](https://github.com/git-mastery/exercises/issues/new?template=request_exercise_repository.md)
for it?
- [ ] Have you written unit tests using
[`repo-smith`](https://github.com/git-mastery/repo-smith) to validate
the exercise grading scheme?
- [X] Have you tested the download script using `test-download.sh`?
- [X] Have you verified that this exercise does not already exist or is
not currently in review?
- [ ] Did you introduce a new grading mechanism that should belong to
[`git-autograder`](https://github.com/git-mastery/git-autograder)?
- [ ] Did you introduce a new dependency that should belong to
[`app`](https://github.com/git-mastery/app)?

Author: jovnc

hands_on/add_files.py

@@ -1,6 +1,7 @@
 import os
 
-from exercise_utils.cli import run_command
+from exercise_utils.git import init
+
 
 __requires_git__ = True
 __requires_github__ = False
@@ -9,4 +10,4 @@
 def download(verbose: bool):
     os.makedirs("things")
     os.chdir("things")
-    run_command(["git", "init", "--initial-branch=main"], verbose)
+    init(verbose)

hands_on/force_push.py

@@ -26,4 +26,4 @@ def download(verbose: bool):
         f"https://github.com/{get_github_username(verbose)}/{REPO_NAME}",
         verbose,
     )
-    run_command(["git", "push", "-u", "origin", "master"], verbose)
+    run_command(["git", "push", "-u", "origin", "main"], verbose)

hands_on/sync_upstream.py

@@ -32,4 +32,4 @@ def download(verbose: bool):
     os.chdir(LOCAL_DIR)
 
     run_command(["git", "reset", "--hard", "HEAD~2"], verbose)
-    run_command(["git", "push", "-f", "origin", "master"], verbose)
+    run_command(["git", "push", "-f", "origin", "main"], verbose)