Add caution: use `git filter-repo` instead of `git filter-branc… (pro…

…git#1352)

Add caution: use `git filter-repo` instead of `git filter-branch`

Merge pull request progit#1354 from aollier/gemfile

asciidoctor version downgrade

Merge pull request progit#1353 from HonkingGoose/progit2_dependabot_c…

…onfig

Create initial dependabot config

Merge pull request progit#1347 from aollier/gemfile

Gemfile: stable version with latest version of gems

Update information about GitHub's private repositories (progit#1346)

Update information about GitHub's private repositories

Merge pull request progit#1343 from Morganov/fix-formatting

Fix formatting

Merge pull request progit#1344 from aollier/installing

installing: git version 2.8.0 is used

Merge pull request progit#1342 from andrewlayman/Grammar-fix

Correct confusing grammar

Remove redundant command (progit#1340)

Remove redundant command

To untrack a tracked file there is a different command now (progit#1338)

To untrack a tracked file there is a different command now