Master -> Main

[pirj]

It happened that the primary branch of this repo is main. Adjust every mention of it.

---

Before submitting the PR make sure the following are checked:

• [x] Feature branch is up-to-date with main (if not - rebase it).
• [x] Squashed related commits together.
• [-] Added tests.
• [x] Updated documentation.
• [-] Added an entry to the CHANGELOG.md if the new code introduces user-observable changes.
• [x] The build (bundle exec rake) passes (be sure to run this locally, since it may produce updated documentation that you will need to commit).

[github-actions[bot]]

yamllint Failed

Show Output

``` ::group::./.github/workflows/main.yml ::error file=./.github/workflows/main.yml,line=7,col=13::7:13 [trailing-spaces] trailing spaces ::endgroup:: ```

Workflow: Linting, Action: __karancode_yamllint-github-action, Lint: .

[github-actions[bot]]

yamllint Failed

Show Output

``` ::group::./.github/workflows/main.yml ::error file=./.github/workflows/main.yml,line=7,col=13::7:13 [trailing-spaces] trailing spaces ::endgroup:: ```

Workflow: Linting, Action: __karancode_yamllint-github-action, Lint: .