Fix in tag.py

[gavv]

Changes:

• Fix error
• Show status
• Sort imports

Error was:

./tag.py --push origin v0.2.2
--- Updating version in roc/version.go to 0.2.2
Traceback (most recent call last):
  File "/home/victor/dev/roc-streaming/roc-go/./tag.py", line 91, in <module>
    main()
  File "/home/victor/dev/roc-streaming/roc-go/./tag.py", line 84, in main
    commit_change(version, force)
TypeError: commit_change() takes 1 positional argument but 2 were given

[coveralls]

coverage: 95.037%. remained the same when pulling 7497627 on gavv:main into 963cc75 on roc-streaming:main.